Taking a look at a WIFI monitor a new 20MHz wide device had sprung up right in the middle of my channel and double my signal strength. I had been using the 155 (149) channel without issue until yesterday evening where, for my phone at least, it slowed to about 0.5MB/s down and 10MB/s up. Same issue again last night, woke up to no 5ghz band on my laptop, it still appears on my phone but will not connect. Wed Feb 3 21:27:52 2021 daemon.notice hostapd: wlan0: AP-CSA-FINISHED freq=5745 dfs=0 Wed Feb 3 21:27:52 2021 daemon.notice hostapd: wlan0: CTRL-EVENT-CHANNEL-SWITCH freq=5745 ht_enabled=1 ch_offset=1 ch_width=80 MHz cf1=5775 cf2=0 dfs=0 Wed Feb 3 21:27:52 2021 kernel: ieee80211 phy0: channel switch is done Wed Feb 3 21:27:52 2021 daemon.notice hostapd: wlan0-1: CTRL-EVENT-STARTED-CHANNEL-SWITCH freq=5745 ht_enabled=1 ch_offset=1 ch_width=80 MHz cf1=5775 cf2=0 dfs=0 Wed Feb 3 21:27:52 2021 daemon.notice hostapd: wlan0: CTRL-EVENT-STARTED-CHANNEL-SWITCH freq=5745 ht_enabled=1 ch_offset=1 ch_width=80 MHz cf1=5775 cf2=0 dfs=0 Wed Feb 3 21:27:52 2021 kernel: ieee80211 phy0: radar detected by firmware Wed Feb 3 21:27:52 2021 daemon.notice hostapd: wlan0: DFS-RADAR-DETECTED freq=5260 ht_enabled=0 chan_offset=0 chan_width=3 cf1=5290 cf2=0 I've trimmed it down to focus on wlan0 but can post more if required. Here is the log around the time my devices disconnected. Restarting the WIFI chipset gets everything back online but I'd like to solve the issue more permenantly. The 5Ghz channel is set to auto at 80Mhz width and I have set the location to United Kingdom. Looking at the log it appears a radar was detected and the router switched channels but I can't determine why devices now cannot connect to the network. My guest interface has disappeared completley. One interface is still visible to devices but attempting to connect just gives up after a couple of seconds without an error. Devices on my 5Ghz band have randomly disconnected.
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