Bridge Core : Reset due to error setting transmit frequency 5550 at temperature 37 C

I am attempting to troubleshoot the error message referenced in the subject of this question. This is a PMP450 AP running 12.2.2 firmware. The AP is running on Channel Center Frequency : 5710.0 MHz. The AP rebooted yesterday and the only relavant error in the event log at the time of the reset was this:

Bridge Core : Reset due to error setting transmit frequency 5550 at temperature 37 C

Can someone explain this to me? Why is the unit trying to reset transmit frequency to 5550 when it is configured to use 5710? And how does temperature relate to setting frequency?