Something really strange has just happened; my Tab A has just, literally about 15 minutes ago, decided to stop recognising my unlock pattern. I know the pattern I'm entering is correct, I was using it right before this happened!! WTF is going on?? So now I can't unlock my tablet cos every time I try it doesn't accept the pattern and then makes me wait 30 seconds before I can try again, i can't even turn it off or restart it because it asks me to draw my unlock pattern. Please help me, I'm getting really frustrated, this makes zero sense