I just ran over this strange irritating problem on one of my laptop devices... The connection times out and drops but still connected to router. No internet works when dropped and cant access WAN either when this happens. When this occurs the internet comes back for some second and then randomly drops fast again
The problem only occurs on 1 laptop and @ 2.4Ghz channel works just fine on 5Ghz.
When internet drops on laptop connected with 2.4 the mobile who is also on 2.4 works just fine