30sp36TT is an older model, do you have an electric puck foot pedal or the older push down pedal with a hydraulic brake slave on the drive unit?

I will suppose you have the newer version, so That should be an EV100 -EV100LX system when you lose travel do the contactors close?

Does the brake disc click and disengage?

I would presume if its lifting and lowering that the battery still has some decent juice, is it noticeably slower in lifting when this happens?

Are you lifting and traveling forward at the same time when this takes place? As that would put a massive draw on the battery and the EV 100 would see the voltage drop and PMT.

PMT = Pulse Monitor Trip

There is no thermal protector on the lift circuit, but there is one on the 1 rec and the brake coil.

I am sorry i need more info to be of more help.