Every once in a while i get this problem, i just unplug the router, and plug it back in. It's almost like the Router is over whelmed by traffic, in a certain time period. I've been looking for a fix for this, but, haven't been lucky.
When no one can connect to it, and the internet as well, i just unplug the power, wait 5 seconds, and plug it in again, viola, Wireless works again.
Would be nice if Dlink puts out a FW update for this issue.
If anyone else knows a way to make it last longer than 36 Hours that would be nice, thanks in advance.