Somehow the swiping in 4 directions mode to unlock the Lock Screen got set and I cannot either activate or cancel it in Settings. Whatever direction / sequence I use is rejected. It seems to cancel it I have to enter the sequence first, but of course I cannot do that. I had not set any lock mode apart from a PIN but it does not offer that option, except it does pop up occassionally after many failures . I will have to keep the tablet open constantly until this is sorted. How do I escape from this Catch 22 situation?