You may want to try a Factory Reset on the PLM.
Unplug it from the AC.
Wait maybe 30 seconds
Hold the SET button and reconnect it to the AC
Keep holding the Set Button for 10 seconds.
Release the Set Button
The LED should go out and in about 30 seconds come back on.
Off hand do you remember the Frimware version on your PLM? I am just currious to what is now being sent out.