your advice as IT technician should be to use an UPS all the time, for something like 3CX or SBC working H24/365 in real time, it cost most of UPS price when you face a failure due to power loss or bad power conditions.in cases where there are no ups and the power plug is pulled ou
If someone recognizes the same problems, the Raspberry Pi is corrupt after a power failure.
A UPS does not help :-(
Founded in 2005, when VoIP was an emerging technology, 3CX has gone on to establish itself as a global leader in business communications.