You can go through my previous posts to see all the tests I've done, but TL;DR, it's overheating and shutting down. I've been talking with Viofo support and they've had me removing and replacing variables to isolate the issue and it keeps coming back to the main unit overheating itself.
This morning, I plugged the factory reset A129 Pro into a USB wall outlet, no rear cam, no GPS mount, and just let it record in 4K while I was gone. I even put a thermometer in it's view to show that my home is only 71F / 21C. It still shutdown sometime before I got back a few hours later.
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