I have a Cisco C9300 is one of my main racks. Recently it has been restarting on it's own. My suspicion that the PSU is on the way out. Strange part is when it does this the VLAN table resets to default. To fix this I have to local logon to it and then enter the VLAN for the management network, pull down the vlan.dat file and overwrite it on flash. Once that is done I reload the switch. When it restarts it comes up working the way it should. Why when the power cuts out does the VLAN table drop? I have seeing this happen on switches when they have PSU issues on multiple other C9300s we have.