Not knowing what you have tried other than rebooting, I would do the following:
Update the firmware. If you are on the latest then I would at least reflash it. (To me this sounds like something got corrupted)
If that doesn't help then I would do some Packet Captures. We have tools built into the GUI that can help with that.
Also you are more than welcome to call in and open a case with an engineer to help troubleshoot this.
http://www.cisco.com/c/en/us/support/web/tsd-cisco-small-business-support-center-contacts.html
Eric Moyers
.:|:.:|:. CISCO | Cisco Presales Technical Support | Wireless Subject Matter Expert
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