Interesting....I noticed this a few days ago as well, and played around a bit with different drives and configurations and no change. Even plugging in a 120gb SSD directly to the usb port and not going through a hub doesn't fix the issue, which I'm sure people already have noted.
In my case, I'm quite often seeing the corrupted files on the left repeater so I sent a message to my SC asking for an appointment, but after reading above it doesn't seem that will do much. Below is a screenshot of what I often see (this shows Left Repeater, but I've also seen on front and right, though much less frequent).
Kind of makes sentry less useful until its fixed. It seems that when I'm driving this doesn't happen, though I dont save those clips. I'll try and saving a couple times over the next few days and seeing if there is any better performance while driving vs in sentry mode...its possible that Tesla is trying to run in 'low power mode' when in sentry and that is leading to the increased chance of corruption....not really buying that, but the only thing I can think of....
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Its not even that the file gets corrupted, its like its the same 1-2 seconds on a loop sometimes for the whole 60 second segment.