My game logs me off every time I get on to my game

I would like to report a bug that is on my iPad mini.It started when I logged on to my minecraft pocket edition which I purchased for 7€. I then logged onto my world and a few seconds later it put me onto the home screen of my iPad . At first I thought it was just a little glitch but it happens every time I log onto my world. Could you please get back to me soon. Yours faithfully,Glen Brogan