For context, i am running Pop Os Linux on the 7840.
every time my laptop wakes from sleep it would not see my 5G wifi network. the only solution was to disable and enable wifi and it would work.
I was looking into this wifi card made by mediatek and it doesnt have a good reputation. so i swapped it out with the intel AX210 from my 12th gen board and now everything is working flawlessly.
The odd thing is it only drops the 5G band after sleep. All the 2.4g networks are there with no issue. So I doubt it’s a power thing. But I’ll make an update if I figure anything out.