The first time this occurred I figured it was a one off circumstance, but I have had it happen a three times now.
Gem-Trans2 keeps sending low battery signals. Replace battery. Restart receiver. Restart panel. Replace battery again, etc etc etc...
Throw transmitter away and replace. Problem solved. These are with brand new installed transmitters with a fresh batteries reading over 3 volts under load.
Just something I thought might benefit another installer. The time spent is worth more than the transmitter. If you get a low bat with a good battery or a fresh replace within a couple weeks just replace the transmitter and save the headaches.