samsung xcover 4, has no internet access while connected to a specific wifi network It seems I'm facing a strange problem with my smartphone.
After the last update, I can't connect to my office's wifi. All the other devices connect normally. However, I tried resetting the router many times. 
On the other hand, my phone connects perfectly to all other networks. I think I did everything possible, even a hard reset, but the problem insists.
 I've tried changing the IP settings to static and typing my IP etc, but nothing worked.
Any other ideas are welcome. 

thanx

Update : When I walk 15 meters away from my desk to another office and try to connect again, my phone connects normally to the same network but from a different router. So, I suppose the problem is between my nearby router and my phone. Is there any way to fix this? It worked till last Friday, so there's no chance of incompatibility.
Perhaps you should upgrade your Android OS version, most of the time this method work for me.