Some potential issues for me. I've experienced a few wifi drops with build r22599, both on 5Ghz channel 36 and 149. I'm using wrt32x. Let me know how your testing goes.
I've reverted to an older snapshot for now.
Here's my wireless config, let me know if you spot anything odd:
config wifi-device 'radio0'
option type 'mac80211'
option path 'soc/soc:pcie/pci0000:00/0000:00:01.0/0000:01:00.0'
option channel '36'
option band '5g'
option htmode 'VHT80'
option country 'FR'
option cell_density '0'
config wifi-iface 'default_radio0'
option device 'radio0'
option network 'lan'
option mode 'ap'
option macaddr '---'
option ssid 'aaa'
option encryption 'psk2'
option key 'xxx'
list maclist 'mac1'
config wifi-device 'radio1'
option type 'mac80211'
option path 'soc/soc:pcie/pci0000:00/0000:00:02.0/0000:02:00.0'
option channel '1'
option band '2g'
option htmode 'HT20'
option country 'FR'
option cell_density '0'
config wifi-iface 'default_radio1'
option device 'radio1'
option network 'lan'
option mode 'ap'
option macaddr '---'
option ssid 'aaa'
option encryption 'psk2'
option key 'xxx'
option macfilter 'deny'
list maclist 'mac1'
list maclist 'mac2'
config wifi-device 'radio2'
option type 'mac80211'
option path 'platform/soc/soc:internal-regs/f10d8000.sdhci/mmc_host/mmc0/mmc0:0001/mmc0:0001:1'
option channel '34'
option band '5g'
option htmode 'VHT80'
option disabled '1'
config wifi-iface 'default_radio2'
option device 'radio2'
option network 'lan'
option mode 'ap'
option ssid 'OpenWrt'
option encryption 'none'