Waking Mac Mini causes router to drop internet connection

Ive got a Mac Mini, Macbook and Dell connected to a belkin wireless router. There all connected wirelessly.

this morning when i used the web from the Dell it worked fine.

then woke the mini from sleep and the internet went down. initially i thought this was the router. but it seems to be waking the mini from sleep that causes the issue.

powering on/off the router or resetting it seems to clear the problem, but that annoying every morning.

does anybody have a fix for this.