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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 5G...
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 5G...