I'm running 9.0.2 on two platforms: Intel Atom and RasPi 3, trying with the same USB SSD disk. No issues at all on Intel.
On RasPi each time I watch the movie, next time the disk doesn't mount, when I connect it to regular PC it shows "disk corrupted", but quick scan & fix is repairing it without loosing any data.
So I have weird procedure:
1. fix the SSD in Windows PC (just scan & repair)
2. connect it to OE on RasPi, watch the movie
3. switch off all, now the disk appears to be corrupted, so when I start OE/RasPi again, it will not see this USB SSD anymore
4. so go to step 1
What OE/RasPi logs may help to pinpoint this issue? Or maybe I missed that is is known issue?