they don't magically change settings.
If the memory component of it fails, it will just revert back to baseline settings every time it is powered on and off.
I have seen buttons that are a little sticky and can move things more then guys realize. Also, if you dont wait for it to come back from adjustment mode (3-5 seconds) where its in its normal display mode it wont save your change. so say you make a quick change and power down instantly, it wont save it.