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Upgrade from Mint 18.3 to 21.1 breaks WiFi (Atheros AR93xx Network Adapter)
Hello,
I've recently upgraded to Linux Mint 21.1 (Kernel: 5.15.0-56-generic) after using Mint 18.3 on the same hardware for several years. However, I now have a recurring problem where nearby WiFi networks disappear (i.e. are not shown in Network Settings) after working as normal for 4-8 hours. I don't know what's causing this; the WiFi connections are visible (and work as normal) on other devices. Note: I have an antenna-type WiFi card slotted into my PC (not a built-in card) with separate 2.4Ghz and 5Ghz channels.
I can get the network back (and use WiFi as normal) by switching the power off and on the router. The WiFi connection works as normal for another 5-8 hours and then disappears again ("state: down" in inxi).
Has anyone seen this before? Many thanks if you are able to help.
Euan
Wifi card: Qualcomm Atheros AR93xx Wireless Network Adapter [168c:0030] (rev 01)
Driver: ath9k
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