As a general thing. back in the early days, I found problems caused by bad connections all along the power train. Driving a large, bouncy vehicle over crappy main roads I had USB leads jiggle out by the merest fraction, power socket jiggle by a fraction etc.
Of course, when the camera then gets all this information in a fraction of a second "turn off, no, wait, we have power, turn back on again - oh, wait, power's just gone, go into shutdown mo...wait, no, it's back up again..."
I also discovered a similar problem with the way diesels work - ignition on, let the glowplugs warm up - power is supplied to the cam.
glowplug light goes out, turn the engine over (and now all power to accessories is cut).
Engine fires, ignition returns to normal mode, all power restored, camera now wants to start - but it is still in shutdown mode.
In my car, I installed a delay timer.
In my bus, I used an extension lead with a built in switch, only turning on once the engine is running.
Even that momentary loss of power at startup was enough to make the cam do the strangest things.
Maybe use the fuse as a temporary 'switch'. You know what's happening with the files, pull the fuse, fire up the engine then insert. Go for a ride (or just let it idle for a long while) then have a look at the files. Actually, letting it idle for ages then set off for a ride - that'll tell you if it's bumps or vibrations disconnecting the power momentarily.
Nothing to lose & you might even find a solution?