Exactly. While I was using 2,4 GHz I had a lot of random issues. Probably faulty/bad WiFi devices from neighbours. Since I switched to 5 GHz they are all gone.

Exactly. While I was using 2,4 GHz I had a lot of random issues. Probably faulty/bad WiFi devices from neighbours. Since I switched to 5 GHz they are all gone. The higher frequency is probably blocked by the walls enough, not to interfere.