Something is different on the tablet of every user for whom it's failed. No-one's going to be able to pin down what's common if what's been done to them isn't clear.

"Specific causes" meant - if it's failed for you - what, exactly have you done to the tablet since you last reflashed it? Saying "nothing, it's the same" and then later it turns out "well, I installed sliderotate" (not mentioning any particular user, here) means something was done.

Software doesn't fail randomly, unless there's a hardware failure. Something is different which is causing reboot loops etc.