The internet disconnects momentarily from time to time and then comes back on

Installing and Using OpenWrt
1

Hello,
I have a problem with OpenWRT, I do not know the end whether it is an OpenWRT problem or with the device, the case looks like this today at the team meeting, I disconnected several times, so I launched the web interface, I looked at the log system and there was such a message:

Thu Nov 19 12:58:31 2020 kern.warn kernel: [12262.107916] ------------[ cut here ]------------
Thu Nov 19 12:58:31 2020 kern.warn kernel: [12262.107946] WARNING: CPU: 0 PID: 0 at net/sched/sch_generic.c:320 0x802c5530
Thu Nov 19 12:58:31 2020 kern.info kernel: [12262.107952] NETDEV WATCHDOG: eth0 (mtk_soc_eth): transmit queue 0 timed out
Thu Nov 19 12:58:31 2020 kern.warn kernel: [12262.107956] Modules linked in: pppoe ppp_async mt76x0e mt76x0_common pppox ppp_generic nf_conntrack_ipv6 mt76x02_lib mt7603e mt76 mac80211 iptable_nat ipt_REJECT ipt_MASQUERADE cfg80211 xt_time xt_tcpudp xt_tcpmss xt_statistic xt_state xt_recent xt_nat xt_multiport xt_mark xt_mac xt_limit xt_length xt_hl xt_helper xt_ecn xt_dscp xt_conntrack xt_connmark xt_connlimit xt_connbytes xt_comment xt_TCPMSS xt_REDIRECT xt_LOG xt_HL xt_FLOWOFFLOAD xt_DSCP xt_CT xt_CLASSIFY slhc nf_reject_ipv4 nf_nat_redirect nf_nat_masquerade_ipv4 nf_conntrack_ipv4 nf_nat_ipv4 nf_nat nf_log_ipv4 nf_flow_table_hw nf_flow_table nf_defrag_ipv6 nf_defrag_ipv4 nf_conntrack_rtcache iptable_raw iptable_mangle iptable_filter ipt_ECN ip_tables crc_ccitt compat act_connmark nf_conntrack sch_tbf sch_ingress sch_htb sch_hfsc em_u32 cls_u32
Thu Nov 19 12:58:31 2020 kern.warn kernel: [12262.108165]  cls_tcindex cls_route cls_matchall cls_fw cls_flow cls_basic act_skbedit act_mirred nf_log_ipv6 nf_log_common ip6table_mangle ip6table_filter ip6_tables ip6t_REJECT x_tables nf_reject_ipv6 ifb leds_gpio gpio_button_hotplug
Thu Nov 19 12:58:31 2020 kern.warn kernel: [12262.108231] CPU: 0 PID: 0 Comm: swapper Not tainted 4.14.195 #0
Thu Nov 19 12:58:31 2020 kern.warn kernel: [12262.108236] Stack : 8046fee0 80054358 80480000 8042ed5c 00000000 00000000 00000000 00000000
Thu Nov 19 12:58:31 2020 kern.warn kernel: [12262.108262]         00000000 00000000 00000000 00000000 00000000 00000001 83807de0 ac07f5da
Thu Nov 19 12:58:31 2020 kern.warn kernel: [12262.108287]         83807e78 00000000 00000000 000040f8 00000038 803ce8b8 00000001 00000000
Thu Nov 19 12:58:31 2020 kern.warn kernel: [12262.108312]         00000000 80460000 000000ce 805d0000 83807dc0 00000000 00000000 80428c10
Thu Nov 19 12:58:31 2020 kern.warn kernel: [12262.108338]         802c5530 00000140 8046ff34 8046fef4 00000003 80460000 00000000 805b0000
Thu Nov 19 12:58:31 2020 kern.warn kernel: [12262.108363]         ...
Thu Nov 19 12:58:31 2020 kern.warn kernel: [12262.108370] Call Trace:
Thu Nov 19 12:58:31 2020 kern.warn kernel: [12262.108379] [<80054358>] 0x80054358
Thu Nov 19 12:58:31 2020 kern.warn kernel: [12262.108424] [<803ce8b8>] 0x803ce8b8
Thu Nov 19 12:58:31 2020 kern.warn kernel: [12262.108438] [<802c5530>] 0x802c5530
Thu Nov 19 12:58:31 2020 kern.warn kernel: [12262.108452] [<8000aa50>] 0x8000aa50
Thu Nov 19 12:58:31 2020 kern.warn kernel: [12262.108459] [<8000aa58>] 0x8000aa58
Thu Nov 19 12:58:31 2020 kern.warn kernel: [12262.108472] [<80026480>] 0x80026480
Thu Nov 19 12:58:31 2020 kern.warn kernel: [12262.108485] [<802c5530>] 0x802c5530
Thu Nov 19 12:58:31 2020 kern.warn kernel: [12262.108499] [<80026508>] 0x80026508
Thu Nov 19 12:58:31 2020 kern.warn kernel: [12262.108519] [<802c5530>] 0x802c5530
Thu Nov 19 12:58:31 2020 kern.warn kernel: [12262.108525] [<802abc48>] 0x802abc48
Thu Nov 19 12:58:31 2020 kern.warn kernel: [12262.108538] [<802c53cc>] 0x802c53cc
Thu Nov 19 12:58:31 2020 kern.warn kernel: [12262.108544] [<8005ffcc>] 0x8005ffcc
Thu Nov 19 12:58:31 2020 kern.warn kernel: [12262.108550] [<8000e0a4>] 0x8000e0a4
Thu Nov 19 12:58:31 2020 kern.warn kernel: [12262.108569] [<800601a0>] 0x800601a0
Thu Nov 19 12:58:31 2020 kern.warn kernel: [12262.108581] [<8029f018>] 0x8029f018
Thu Nov 19 12:58:31 2020 kern.warn kernel: [12262.108603] [<83185658>] 0x83185658 [ifb@83185000+0xbe0]
Thu Nov 19 12:58:31 2020 kern.warn kernel: [12262.108612] [<803d4368>] 0x803d4368
Thu Nov 19 12:58:31 2020 kern.warn kernel: [12262.108618] [<8005a554>] 0x8005a554
Thu Nov 19 12:58:31 2020 kern.warn kernel: [12262.108624] [<80055ab0>] 0x80055ab0
Thu Nov 19 12:58:31 2020 kern.warn kernel: [12262.108633] [<80005e90>] 0x80005e90
Thu Nov 19 12:58:31 2020 kern.warn kernel: [12262.108636]
Thu Nov 19 12:58:31 2020 kern.warn kernel: [12262.108642] ---[ end trace dd8029f3287d7ca8 ]---

And the following logs as OpenWRT disconnected my computer after these 9 disconnections, I changed the port to 2 but it's still the same. I hope someone will help me quickly. I attach the logs in the attachment:
System Log: http://hastebin.cf/edibacotiq.properties
Kernel Log: http://hastebin.cf/yuzipuzeli.sql
Please don't shout at me I'm new to this environment

2

Which router do you have? I notice the same issue on my C2600.

3

@dutch010 I have TP-LINK Archer C20 AC750 Wireless Dual Band Router

4

And running the lastest OpenWRT (19.07.4) currently?

5

I'm seeing the same dmesg on my ZBT-WE1326 (MT7621) running 19.07.1. The router recovers and continues to operate perfectly fine.

[ 2426.991102] conntrack: generic helper won't handle protocol 47. Please consider loading the specific helper module.
[25314.386502] mtk_soc_eth 1e100000.ethernet eth0: port 3 link down
[25318.195929] mtk_soc_eth 1e100000.ethernet eth0: port 3 link up
[28242.053791] ------------[ cut here ]------------
[28242.058433] WARNING: CPU: 1 PID: 0 at net/sched/sch_generic.c:320 0x8038b2f0
[28242.065479] NETDEV WATCHDOG: eth0 (mtk_soc_eth): transmit queue 0 timed out
[28242.072408] Modules linked in: pppoe ppp_async pppox ppp_generic nf_conntrack_ipv6 mt76x2e mt76x2_common mt76x02_lib mt7603e mt76 mac80211 iptable_nat ipt_REJECT ipt_MASQUERADE cfg80211 xt_time xt_tcpudp xt_state xt_nat xt_multiport xt_mark xt_mac xt_limit xt_conntrack xt_comment xt_TCPMSS xt_REDIRECT xt_LOG xt_FLOWOFFLOAD xt_CT slhc nf_reject_ipv4 nf_nat_redirect nf_nat_masquerade_ipv4 nf_conntrack_ipv4 nf_nat_ipv4 nf_nat nf_log_ipv4 nf_flow_table_hw nf_flow_table nf_defrag_ipv6 nf_defrag_ipv4 nf_conntrack_rtcache nf_conntrack iptable_mangle iptable_filter ip_tables crc_ccitt compat nf_log_ipv6 nf_log_common ip6table_mangle ip6table_filter ip6_tables ip6t_REJECT x_tables nf_reject_ipv6 tun mmc_block mtk_sd mmc_core leds_gpio xhci_plat_hcd xhci_pci xhci_mtk xhci_hcd gpio_button_hotplug usbcore nls_base
[28242.143399]  usb_common
[28242.145874] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.14.167 #0
[28242.151943] Stack : 00000000 00000000 00000000 8ff5ab40 00000000 00000000 00000000 00000000
[28242.160285]         00000000 00000000 00000000 00000000 00000000 00000001 8fc0bd60 ac07f5be
[28242.168623]         8fc0bdf8 00000000 00000000 00006308 00000038 8049b6d8 00000007 00000000
[28242.176958]         00000000 80550000 000239d2 00000000 8fc0bd40 00000000 00000000 80509e3c
[28242.185291]         8038b2f0 00000140 00000001 8ff5ab40 00000000 802ac758 00000004 806b0004
[28242.193623]         ...
[28242.196058] Call Trace:
[28242.196112] [<8049b6d8>] 0x8049b6d8
[28242.202012] [<8038b2f0>] 0x8038b2f0
[28242.205488] [<802ac758>] 0x802ac758
[28242.208965] [<8000c1a0>] 0x8000c1a0
[28242.212434] [<8000c1a8>] 0x8000c1a8
[28242.215905] [<80484544>] 0x80484544
[28242.219374] [<800719f0>] 0x800719f0
[28242.222850] [<8002e5f8>] 0x8002e5f8
[28242.226321] [<8038b2f0>] 0x8038b2f0
[28242.229799] [<8002e680>] 0x8002e680
[28242.233271] [<80055048>] 0x80055048
[28242.236756] [<8038b2f0>] 0x8038b2f0
[28242.240227] [<80099860>] 0x80099860
[28242.243699] [<8038b144>] 0x8038b144
[28242.247172] [<8008842c>] 0x8008842c
[28242.250642] [<8005f15c>] 0x8005f15c
[28242.254122] [<800886e8>] 0x800886e8
[28242.257594] [<80079038>] 0x80079038
[28242.261065] [<804a24d8>] 0x804a24d8
[28242.264547] [<80032f84>] 0x80032f84
[28242.268027] [<80259e70>] 0x80259e70
[28242.271500] [<80007488>] 0x80007488
[28242.274976] 
[28242.276540] ---[ end trace 6fb4207a2f150ae3 ]---
[28242.281152] mtk_soc_eth 1e100000.ethernet eth0: transmit timed out
[28242.287321] mtk_soc_eth 1e100000.ethernet eth0: dma_cfg:80000065
[28242.293310] mtk_soc_eth 1e100000.ethernet eth0: tx_ring=0, base=0f3c0000, max=0, ctx=1292, dtx=1292, fdx=1291, next=1292
[28242.304161] mtk_soc_eth 1e100000.ethernet eth0: rx_ring=0, base=0e160000, max=0, calc=393, drx=394
[28242.316437] mtk_soc_eth 1e100000.ethernet: 0x100 = 0x6060000c, 0x10c = 0x80818
[28242.328984] mtk_soc_eth 1e100000.ethernet: PPE started
root@OpenWrt:~# 
root@OpenWrt:~# cat /proc/uptime
103975.43 413342.04
root@OpenWrt:~#