I have a client using SBS 2011 (Patched to the latest security patches). I installed a new WAP (Wireless Access Point) on the network and everything is fine for 3-4 days and suddenly nobody can get access to external Websites (DNS down - Looks like). But as soon as I unplug the WAP from the network - everybody gets internet access again. I have installed two different brands of WAP and both do the same thing in about 3-4 days. If I reboot WAP and plug it back in i get another 3-4 days.
Jonathan Schwartz