SOLUTION: I spoke with Tesla support and had a service appointment for this issue (overkill I know, but curious to see what they said). The Tesla rep reported that they had some information to suggest that the issue occurs with USB drives LARGER than 32GB. Seemed hard to believe that this was the issue, as I was using a very high write speed USB 3.1 solution previously. However, I bought the
$9 Samsung MUF-32AB/AM FIT Plus 32GB drive on Amazon and is is working perfectly several days in (whereas I always got the alert within an hour previously). I'm holding on to my 128 GB USB drive in hopes that the next update solves the problem, but for $9 this was a good work around. Only problem is that the drive obviously fills up very quickly if using Sentry Mode. Hope this is helpful.