Mine did the same thing. Figured it out when it ran my battery down to zero a couple times and I didn’t know why. Took that POS off and keep it in the glove box. Recently had to send it back because it crapped out during data logging at the track. Things are crap.
I agree their crap, broke the USB port off mine, no fault of mine, was from plug they sent with it, lifted the socket off the printed circuit board, cost 100$ for a replacement, replaced with a new unit. What I can say I like about mine is data recording at any time at the touch of a button, no lap top needed. Mine does glitch once in a while saving data and loose the collection but when it starts doing that I transfer the log file from T2 to your pc and empty the log file on the T2 and good for 50-60 log files again depending on size. I switched to HPT for tuning but still use the T2EX for logging.
And even the replacement acts the same way, I need to plug it into a running car, set it up to gauges, then shut car off and it restarts with car start and shuts off when car is shut off. I’m not defending the POS, just putting it out there how mine works for me. I wish HPT would make a interface as small so a laptop is not needed on the passenger seat when I want to data log.