I have the problem in my SR+ that the recording seems to be a bit flaky - I first tried a 128 GB pure Tesla USB stick, but after a few weeks that failed as the car would say that the write speed wasn't high enough. If you unplugged it and plugged it back in again it would be fine until the next sentry cam incident... (i.e. not ideal).
Next I got a 256GB SD card and an SD card reader (and write) - that worked fine for a week or so, and then I got the same problem. I thought it might have been the old SD card reader, so I got a new one, but that failed after a few hours! That new reader won't even work in my PC now for some reason, and if I check the SD card it's apparently blank (although I think I'll double check that at home to be sure).