OK on your video, that didn't lose autotrack because of your car. If that were the case, it would have followed him halfway into the car and stopped.
It locked onto something else. That is where the SD card with IVS on during playback can help you pinpoint what it locked onto.
From my experience, I think it might have locked on the plate across the street or the mailbox.
Bring more contrast into the image to tone down the bright reflective stuff. It will lock on that all night.
Do you have enough light that you can run color?