Please advise if this is a software bug, but our x440-24p switch produced an error: POE port_fault and cause our access points to fail. To fix the issue the PoE had to be disable and re-enabled on the entire switch. However, the VoIP phones were no affected.
Reset inline-power on the offending port did not resolve the issue? 90% of the POE faults I have seen have been drop related. The exception being pse uart errors which have also resulted in RMAs thus far.
How many of the ports are being used for POE? All the POE classes have a range and if there is a spike in power needed this could cause some of the ports to go into a fault state. As David mentioned, have you tried to reset inline-power on the port that faulted? This should work.