Registered an account just to reply to this. I know it's an old post, but just in case anyone searching for answers sees this.
I'm also an owner of the 322GW model, with rear dash cam connected, and wired into my OBD connection. Am driving a 2015 Ford Focus Titanium (1.6 diesel), and previously had dash cam powered by car lighter adapter.
Encountered same issues of dash cam alarming (SD card corrupting) which has been mostly resolved by buying medium capacity (64gb/128gb) U3 (high writing speed essential) which reduced occurrence, as did regularly formatting SD card from the dash cam menu "Setup" section whenever I remember (several times/week)
Also experience issue of dash cam not turning off when turning off car (would stay on for 20+mins after shutdow). My workaround is I made sure the auto-start setting was enabled. Now, everytime I turn off the car, I hold down the power button on the left hand-side to manually turn it off. This prevents it overheating and draining battery, which I suspect has something to do with corrupting SD cards. No issues since, and turning on ignition automatically turns it on and starts recording, so no fear of forgetting to turn it on.
Hope this helps someone! ๐