Router gives request timeout after few mins.

Hello,

We have been experiencing problems regarding our wi fi connections and we've been trying to fix these for about a month already. When I tried to ping google.com it gives replies but then gives a "request time out" after about a minute. I already tried ipconfig /release and /renew but to no use. We already tried to reset the router but still the same issue exists. We then decided to change the router but still gave the same problem. The router is connected to the switch and all desktop computers connected to the switch doesn't experience the same problem.

I'd appreciate any help. Thanks in advance.