First thing i would do is to see if i was able to move a file off the card and then back onto the card again, if you cant do that the memory card can be locked in read only mode, this is something they can do if they encounter a major error and go into panic mode.
If that seem to work i would still run the SD formatted tool on the memory card, as explained above, this will probably take a while with a larger card, but you can do other stuff meanwhile on the computer or elsewhere.
If you have had proper operation for X - XX weeks up until now ( assume you have looked at the memory card before today ) then i dont think it is a issue of where / how the system are hardwired.
I had a few problems myself with my DR, but they all vaporized when i put a new little battery in my 2012 little car.
As i recall not waking up and record was 1 thing, but i must admit it never happened for me days on end, when it did as the system have no power on / off button i had to pull the little power plug apart and then put it back together to record.
But in my case this was always on the #1 drive of the day, but mostly it rectified itself after a short stop at the gas station and then setting off from there ( but not always )
And i only use 1 hour parking guard as i dont need more.
It is a problem SG are aware off, and it should not really be there, my old battery while a 2012 one it was not showing any signs on immediate death, my car cranked just fine and the voltages appeared to be fine.
Adjustments in regard to this should be in the next firmware, i did not get around to try this myself, but maybe you can bypass it by using a longer boot delay so the car can get up and running better before the camera kick in ( it is worth a try and easy to select a longer boot delay in the menu )