This used to be an issue back in 8.xx when we had the perfdll.dll file which provided hooks to load performance counters into the Microsoft Performance Monitor. About the only thing that comes to mind here is if you had the QEMC open to the Performance menu on the Status tab or something like that and left it open/running. What I would really recommend is you get a case opened with support on this one as soon as you can provide as much detail on the environment etc as you can to assist us in trying to replicate the issue.
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Would you happen to know if there is a work around for this error on QV 8.50? I have a number of sites that have gotten this error. Upgrading our verions of QV is in the works, but I wondered if there was something that could be done in the meantime.
The Phoenix thread is just a thread that restarts the server if it fails to respond in a timely way. In other words - there can be different reasons that caused the server to hang in the first place. So, you may have this message for completely different reasons.