We currently have 360 - 8821 devices in productions. I have one group who insist their phone will shutoff on its own. I have replaced this device 3 times and they are still reporting this issue. Signal in both areas that this has been reported is good and we actually adding another AP near one of the rooms to make sure there were not coverage issues. The phones I have replaced are now on my desk configured with two new extensions. I have not experienced the issue of them shutting off at all. Has anyone experienced 8821 phone turning themselves off on their own? I would like any input to this matter since I cannot find a resolution to this matter and now. We are running System version: 11.5.1.18900-97 on call manager.
In addition to what @Leo Laohoo proposes it might be also helpful to open a TAC case (if you have a contract) to speed-up your process of troubleshooting.
George
Hope the above helps, gsotirop
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