We bought WWE payback & are watching in through On Demand. We watched about an hour of it then had to stop it, went to watch again but program had gone back to the start. Had to watch from the start then we need to stop it again. When we restarted it was at a random point of the program. Then stopped went to watch again - this time it went back to the start. We can use the bottom for go backwards or forwards - any help?