Nexus 7 2013, 5.1.1: Why does internet intermittently get very very slow?

A

AC Question

Every 2-3 weeks internet site loading slows to an absolute crawl. All other WiFi clients on same router do not have this issue. The only way to fix this is to re-set dhcp on router to a different number; I.e., change from 8.8.8.8 to 8.8.4.4

This change always fixes the problem immediately, but is a pain. Don't ask how long it took to find this bandaid. This has happened since new a few months ago.

Anybody know what the root problem may be?

Thank you for your help and input

John