I have 2 routers. One km connection room in the basement, one on the ground floor as an access point. In the attic, so through 2 wooden ceilings, I still have network via the access point. On the ground floor, I have no network from the basement router because there is a reinforced concrete ceiling in between,... You should have no network problems in the attic, possibly with environmental influences. I restart the router directly via the router's console (accessible via IP).