Same issue here. it was working fine for the first 6 hours i had it;
Bought 15 lunch boxes, had a whole load of pregnant people.
It happened on a samsung that was on Kitkat. I thought that making room on my internal storage might help. Now I have lots of space and it still isn't working. Also successfully updated to Lollipop this morning, with no luck. Sent an email for support and it said to come to this website. Lets hope there is a update or solution for this soon!