There is a safe way to test this. Perhaps some of the experts in here can tell us what the auto start contacts are on the terminal board. If you make the contacts there instead of the em. stop, the unit will auto restart after the fire alarm, thus making all the previous calls the fault of the fire alarm co. I have been down this road. If the problem is not resolved then you know you have another issue.
I STARTED WITH NOTHING, AND I STILL HAVE MOST OF IT!