Looks like for me disabling "Standby" mode did not do anything. I had "Standby" option disabled all weekend and this morning still could see recordings about 20 minutes after I parked car.
Yours stop after about 20 minutes?
Others have reported that theirs don't stop at all. This seems like the car thinks you are still in it. Once you put the car in park, it will shut down after approximately 15 minutes even if you stay in the car.