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Re: Upgrade from Mint 18.3 to 21.1 breaks WiFi (Atheros AR93xx Network Adapter)

5G penetration is typically not as good as 2.4G and some devices seem to switch bands without warning preferring a faster connection even if the signal's not quite up to it. I've found a dual-band WiFi repeater plug is a pretty good solution, placed half way between the router and the device .. I've had good results from a TP-Link N-300, £12 from Amazon ... Failing that, I've found turning off 5G on the router also works albeit you end up with a much slower connection ... fine for TV/Roku boxes, no so mu...
5G penetration is typically not as good as 2.4G and some devices seem to switch bands without warning preferring a faster connection even if the signal's not quite up to it. I've found a dual-band WiFi repeater plug is a pretty good solution, placed half way between the router and the device .. I've had good results from a TP-Link N-300, £12 from Amazon ... Failing that, I've found turning off 5G on the router also works albeit you end up with a much slower connection ... fine for TV/Roku boxes, no so mu...