I'd be tempted to power cycle the master switch rather than the router and see if that restores connectivity.

As for the error messages, I'd raise that directly with support.

I have 2 x 910c powered by a Netgear Prosafe POE giga switch which are managed by my 2925 with no issues. APs only get rebooted if a new firmware is applied.

Just a quick update.

I have switched off the router's AP management service, and we have not experienced any problems since. Thanks to everyone for your help.

Hi. I am having a similar problem with an AP810 and 2860n Router. I will update the firmware and after that is the idea that AP Management is used to populate the settings and is then switched off? Or should I note all the settings, reset and then populate everything manually? Thanks.