Every one of my older edgerouter lites have failed USB drives. Final one was just a couple of days ago. I would estimate probably 30 devices in total. These are the older units with the angled edges. I replaced every one of them with SanDisk Cruzer Fit 8GB flash drives. I've not had a single failure with the SanDisk flash drive. The fix is easy and costs about $4.
I've also not had a single failure with any of the new edgerouter lites (square edge case). I've also not had a single failure with any other edgerouter line.
If you are really concerned, replace the flash drive in all of your ER-Lites that have the angled corners.