Zyxel NBG6817 Wi-Fi issue at 21.02

Can someone explain to me why this morning I could not connect to Wi-Fi: the network was simply not on the air, and in the logs I saw this:


Fri Sep 17 04:52:59 2021 daemon.notice hostapd: wlan0: DFS-RADAR-DETECTED freq=5660 ht_enabled=0 chan_offset=0 chan_width=3 cf1=5690 cf2=0
Fri Sep 17 04:52:59 2021 daemon.notice hostapd: dfs_downgrade_bandwidth: no DFS channels left, waiting for NOP to finish
Fri Sep 17 04:52:59 2021 daemon.notice hostapd: wlan0: AP-DISABLED
Fri Sep 17 04:52:59 2021 daemon.notice hostapd: nl80211: deinit ifname=wlan0 disabled_11b_rates=0
Fri Sep 17 04:52:59 2021 kern.info kernel: [537396.125955] device wlan0 left promiscuous mode
Fri Sep 17 04:52:59 2021 kern.info kernel: [537396.126105] br-lan: port 2(wlan0) entered disabled state
Fri Sep 17 04:53:00 2021 daemon.notice netifd: Network device 'wlan0' link is down
Fri Sep 17 04:53:00 2021 kern.info kernel: [537396.177816] ath10k_pci 0000:01:00.0: mac flush null vif, drop 0 queues 0xffff
Fri Sep 17 04:53:00 2021 kern.warn kernel: [537396.180594] ath10k_pci 0000:01:00.0: peer-unmap-event: unknown peer id 0
Fri Sep 17 04:53:00 2021 kern.warn kernel: [537396.183949] ath10k_pci 0000:01:00.0: peer-unmap-event: unknown peer id 0
Fri Sep 17 04:53:00 2021 kern.warn kernel: [537396.190884] ath10k_pci 0000:01:00.0: peer-unmap-event: unknown peer id 0
Fri Sep 17 04:53:00 2021 daemon.notice hostapd: wlan0: interface state ENABLED->DISABLED
Fri Sep 17 04:53:06 2021 kern.warn kernel: [537402.183329] ath10k_pci 0000:01:00.0: 10.4 wmi init: vdevs: 16  peers: 48  tid: 96
Fri Sep 17 04:53:06 2021 kern.warn kernel: [537402.183354] ath10k_pci 0000:01:00.0: msdu-desc: 2500  skid: 32
Fri Sep 17 04:53:06 2021 kern.info kernel: [537402.263840] ath10k_pci 0000:01:00.0: wmi print 'P 48/48 V 16 K 144 PH 176 T 186  msdu-desc: 2500  sw-crypt: 0 ct-sta: 0'
Fri Sep 17 04:53:06 2021 kern.info kernel: [537402.264663] ath10k_pci 0000:01:00.0: wmi print 'free: 84920 iram: 13156 sram: 11224'
Fri Sep 17 04:53:06 2021 kern.info kernel: [537402.643408] ath10k_pci 0000:01:00.0: rts threshold -1
Fri Sep 17 04:53:06 2021 kern.warn kernel: [537402.646704] ath10k_pci 0000:01:00.0: Firmware lacks feature flag indicating a retry limit of > 2 is OK, requested limit: 4
Fri Sep 17 04:53:06 2021 kern.info kernel: [537402.651478] br-lan: port 2(wlan0) entered blocking state
Fri Sep 17 04:53:06 2021 kern.info kernel: [537402.658570] br-lan: port 2(wlan0) entered disabled state
Fri Sep 17 04:53:06 2021 kern.info kernel: [537402.664317] device wlan0 entered promiscuous mode
Fri Sep 17 04:53:06 2021 daemon.notice hostapd: wlan0: interface state DISABLED->COUNTRY_UPDATE
Fri Sep 17 04:53:06 2021 daemon.notice hostapd: wlan0: interface state COUNTRY_UPDATE->HT_SCAN
Fri Sep 17 04:53:06 2021 daemon.notice hostapd: wlan0: DFS-RADAR-DETECTED freq=5660 ht_enabled=0 chan_offset=0 chan_width=3 cf1=5690 cf2=0
Fri Sep 17 04:53:06 2021 daemon.notice hostapd: dfs_downgrade_bandwidth: no DFS channels left, waiting for NOP to finish
Fri Sep 17 04:53:06 2021 daemon.notice hostapd: wlan0: AP-DISABLED
Fri Sep 17 04:53:06 2021 daemon.err hostapd: hostapd_free_hapd_data: Interface wlan0 wasn't started
Fri Sep 17 04:53:06 2021 daemon.notice hostapd: nl80211: deinit ifname=wlan0 disabled_11b_rates=0
Fri Sep 17 04:53:06 2021 kern.info kernel: [537402.705884] device wlan0 left promiscuous mode
Fri Sep 17 04:53:06 2021 kern.info kernel: [537402.705961] br-lan: port 2(wlan0) entered disabled state
Fri Sep 17 04:53:06 2021 kern.warn kernel: [537402.747269] ath10k_pci 0000:01:00.0: peer-unmap-event: unknown peer id 0
Fri Sep 17 04:53:06 2021 daemon.notice hostapd: wlan0: interface state HT_SCAN->DISABLED
Fri Sep 17 04:53:12 2021 kern.warn kernel: [537408.723526] ath10k_pci 0000:01:00.0: 10.4 wmi init: vdevs: 16  peers: 48  tid: 96
Fri Sep 17 04:53:12 2021 kern.warn kernel: [537408.723552] ath10k_pci 0000:01:00.0: msdu-desc: 2500  skid: 32
Fri Sep 17 04:53:12 2021 kern.info kernel: [537408.804177] ath10k_pci 0000:01:00.0: wmi print 'P 48/48 V 16 K 144 PH 176 T 186  msdu-desc: 2500  sw-crypt: 0 ct-sta: 0'
Fri Sep 17 04:53:12 2021 kern.info kernel: [537408.805011] ath10k_pci 0000:01:00.0: wmi print 'free: 84920 iram: 13156 sram: 11224'
Fri Sep 17 04:53:13 2021 kern.info kernel: [537409.183502] ath10k_pci 0000:01:00.0: rts threshold -1
Fri Sep 17 04:53:13 2021 kern.warn kernel: [537409.186422] ath10k_pci 0000:01:00.0: Firmware lacks feature flag indicating a retry limit of > 2 is OK, requested limit: 4
Fri Sep 17 04:53:13 2021 kern.info kernel: [537409.191731] br-lan: port 2(wlan0) entered blocking state
Fri Sep 17 04:53:13 2021 kern.info kernel: [537409.198663] br-lan: port 2(wlan0) entered disabled state
Fri Sep 17 04:53:13 2021 kern.info kernel: [537409.204429] device wlan0 entered promiscuous mode
Fri Sep 17 04:53:13 2021 daemon.notice hostapd: wlan0: interface state DISABLED->COUNTRY_UPDATE
Fri Sep 17 04:53:13 2021 daemon.notice hostapd: wlan0: interface state COUNTRY_UPDATE->HT_SCAN
Fri Sep 17 04:53:13 2021 daemon.notice hostapd: wlan0: DFS-RADAR-DETECTED freq=5660 ht_enabled=0 chan_offset=0 chan_width=3 cf1=5690 cf2=0
Fri Sep 17 04:53:13 2021 daemon.notice hostapd: dfs_downgrade_bandwidth: no DFS channels left, waiting for NOP to finish
Fri Sep 17 04:53:13 2021 daemon.notice hostapd: wlan0: AP-DISABLED
Fri Sep 17 04:53:13 2021 daemon.err hostapd: hostapd_free_hapd_data: Interface wlan0 wasn't started
Fri Sep 17 04:53:13 2021 daemon.notice hostapd: nl80211: deinit ifname=wlan0 disabled_11b_rates=0
Fri Sep 17 04:53:13 2021 kern.info kernel: [537409.245908] device wlan0 left promiscuous mode
Fri Sep 17 04:53:13 2021 kern.info kernel: [537409.245984] br-lan: port 2(wlan0) entered disabled state
Fri Sep 17 04:53:13 2021 kern.warn kernel: [537409.287334] ath10k_pci 0000:01:00.0: peer-unmap-event: unknown peer id 0
Fri Sep 17 04:53:13 2021 daemon.notice hostapd: wlan0: interface state HT_SCAN->DISABLED
Fri Sep 17 04:53:19 2021 kern.warn kernel: [537415.264118] ath10k_pci 0000:01:00.0: 10.4 wmi init: vdevs: 16  peers: 48  tid: 96
Fri Sep 17 04:53:19 2021 kern.warn kernel: [537415.264144] ath10k_pci 0000:01:00.0: msdu-desc: 2500  skid: 32
Fri Sep 17 04:53:19 2021 kern.info kernel: [537415.344719] ath10k_pci 0000:01:00.0: wmi print 'P 48/48 V 16 K 144 PH 176 T 186  msdu-desc: 2500  sw-crypt: 0 ct-sta: 0'
Fri Sep 17 04:53:19 2021 kern.info kernel: [537415.345546] ath10k_pci 0000:01:00.0: wmi print 'free: 84920 iram: 13156 sram: 11224'
Fri Sep 17 04:53:19 2021 kern.info kernel: [537415.724441] ath10k_pci 0000:01:00.0: rts threshold -1
Fri Sep 17 04:53:19 2021 kern.warn kernel: [537415.727914] ath10k_pci 0000:01:00.0: Firmware lacks feature flag indicating a retry limit of > 2 is OK, requested limit: 4
Fri Sep 17 04:53:19 2021 kern.info kernel: [537415.732694] br-lan: port 2(wlan0) entered blocking state
Fri Sep 17 04:53:19 2021 kern.info kernel: [537415.739625] br-lan: port 2(wlan0) entered disabled state
Fri Sep 17 04:53:19 2021 daemon.notice hostapd: wlan0: interface state DISABLED->COUNTRY_UPDATE
Fri Sep 17 04:53:19 2021 daemon.notice hostapd: wlan0: interface state COUNTRY_UPDATE->HT_SCAN
Fri Sep 17 04:53:19 2021 daemon.notice hostapd: wlan0: DFS-RADAR-DETECTED freq=5660 ht_enabled=0 chan_offset=0 chan_width=3 cf1=5690 cf2=0
Fri Sep 17 04:53:19 2021 daemon.notice hostapd: dfs_downgrade_bandwidth: no DFS channels left, waiting for NOP to finish
Fri Sep 17 04:53:19 2021 daemon.notice hostapd: wlan0: AP-DISABLED
Fri Sep 17 04:53:19 2021 daemon.err hostapd: hostapd_free_hapd_data: Interface wlan0 wasn't started
Fri Sep 17 04:53:19 2021 daemon.notice hostapd: nl80211: deinit ifname=wlan0 disabled_11b_rates=0
Fri Sep 17 04:53:19 2021 kern.info kernel: [537415.745420] device wlan0 entered promiscuous mode
Fri Sep 17 04:53:19 2021 kern.info kernel: [537415.785974] device wlan0 left promiscuous mode
Fri Sep 17 04:53:19 2021 kern.info kernel: [537415.786050] br-lan: port 2(wlan0) entered disabled state
Fri Sep 17 04:53:19 2021 kern.warn kernel: [537415.827580] ath10k_pci 0000:01:00.0: peer-unmap-event: unknown peer id 0
Fri Sep 17 04:53:19 2021 daemon.notice hostapd: wlan0: interface state HT_SCAN->DISABLED
Fri Sep 17 04:53:25 2021 kern.warn kernel: [537421.819795] ath10k_pci 0000:01:00.0: 10.4 wmi init: vdevs: 16  peers: 48  tid: 96
Fri Sep 17 04:53:25 2021 kern.warn kernel: [537421.819821] ath10k_pci 0000:01:00.0: msdu-desc: 2500  skid: 32
Fri Sep 17 04:53:25 2021 kern.info kernel: [537421.900312] ath10k_pci 0000:01:00.0: wmi print 'P 48/48 V 16 K 144 PH 176 T 186  msdu-desc: 2500  sw-crypt: 0 ct-sta: 0'
Fri Sep 17 04:53:25 2021 kern.info kernel: [537421.901116] ath10k_pci 0000:01:00.0: wmi print 'free: 84920 iram: 13156 sram: 11224'
Fri Sep 17 04:53:26 2021 kern.info kernel: [537422.279603] ath10k_pci 0000:01:00.0: rts threshold -1
Fri Sep 17 04:53:26 2021 kern.warn kernel: [537422.282980] ath10k_pci 0000:01:00.0: Firmware lacks feature flag indicating a retry limit of > 2 is OK, requested limit: 4
Fri Sep 17 04:53:26 2021 kern.info kernel: [537422.288253] br-lan: port 2(wlan0) entered blocking state
Fri Sep 17 04:53:26 2021 kern.info kernel: [537422.294721] br-lan: port 2(wlan0) entered disabled state
Fri Sep 17 04:53:26 2021 kern.info kernel: [537422.300607] device wlan0 entered promiscuous mode
Fri Sep 17 04:53:26 2021 daemon.notice hostapd: wlan0: interface state DISABLED->COUNTRY_UPDATE
Fri Sep 17 04:53:26 2021 daemon.notice hostapd: wlan0: interface state COUNTRY_UPDATE->HT_SCAN
Fri Sep 17 04:53:26 2021 daemon.err hostapd: could not get valid channel
Fri Sep 17 04:53:26 2021 daemon.notice hostapd: wlan0: interface state HT_SCAN->DFS
Fri Sep 17 05:23:17 2021 daemon.notice hostapd: wlan0: DFS-NOP-FINISHED freq=5660 ht_enabled=0 chan_offset=0 chan_width=0 cf1=5660 cf2=0
Fri Sep 17 05:23:17 2021 daemon.err hostapd: could not get valid channel
Fri Sep 17 05:23:17 2021 daemon.notice hostapd: wlan0: interface state DFS->DFS
Fri Sep 17 05:23:17 2021 daemon.notice hostapd: wlan0: DFS-NOP-FINISHED freq=5680 ht_enabled=0 chan_offset=0 chan_width=0 cf1=5680 cf2=0
Fri Sep 17 05:23:17 2021 daemon.notice hostapd: wlan0: interface state DFS->DFS
Fri Sep 17 05:23:17 2021 daemon.notice hostapd: wlan0: DFS-CAC-START freq=5660 chan=132 sec_chan=1, width=0, seg0=138, seg1=0, cac_time=60s
Fri Sep 17 05:23:17 2021 daemon.err hostapd: 20/40 MHz: center segment 0 (=138) and center freq 1 (=5670) not in sync
Fri Sep 17 05:23:17 2021 daemon.err hostapd: Can't set freq params
Fri Sep 17 05:23:17 2021 daemon.err hostapd: DFS start_dfs_cac() failed, -1
Fri Sep 17 05:23:17 2021 daemon.notice hostapd: wlan0: DFS-NOP-FINISHED freq=5700 ht_enabled=0 chan_offset=0 chan_width=0 cf1=5700 cf2=0
Fri Sep 17 05:23:17 2021 daemon.notice hostapd: wlan0: interface state DFS->DFS
Fri Sep 17 05:23:17 2021 daemon.notice hostapd: wlan0: DFS-CAC-START freq=5660 chan=132 sec_chan=1, width=0, seg0=138, seg1=0, cac_time=60s
Fri Sep 17 05:23:17 2021 daemon.err hostapd: 20/40 MHz: center segment 0 (=138) and center freq 1 (=5670) not in sync
Fri Sep 17 05:23:17 2021 daemon.err hostapd: Can't set freq params
Fri Sep 17 05:23:17 2021 daemon.err hostapd: DFS start_dfs_cac() failed, -1
Fri Sep 17 05:23:17 2021 daemon.notice hostapd: wlan0: DFS-NOP-FINISHED freq=5720 ht_enabled=0 chan_offset=0 chan_width=0 cf1=5720 cf2=0
Fri Sep 17 05:23:17 2021 daemon.notice hostapd: wlan0: interface state DFS->DFS
Fri Sep 17 05:23:17 2021 daemon.notice hostapd: wlan0: DFS-CAC-START freq=5660 chan=132 sec_chan=1, width=0, seg0=138, seg1=0, cac_time=60s
Fri Sep 17 05:23:17 2021 daemon.err hostapd: 20/40 MHz: center segment 0 (=138) and center freq 1 (=5670) not in sync
Fri Sep 17 05:23:17 2021 daemon.err hostapd: Can't set freq params
Fri Sep 17 05:23:17 2021 daemon.err hostapd: DFS start_dfs_cac() failed, -1

I too have an issue with my Zyxel Armor Z2 (NBG6817) on 21.02.
The 5ghz Wifi crashes during large downloads like Steam games. Regular use seems to be fine.