I occasionally get a message that I have a sentry event when parked in a public area. Sometimes I am unable to view the dash cam or sentry footage after that. I can take to drive to a computer an either view the files or find that there are several hundred files. Most of which are 1kB. I Have to delete all files and sometimes reformat the USB drive before it will work again in the car. I am using a Samsung easy store drive. Any thoughts?