New to the forum so bear w/ me. My husband has an Ipad Air, IOS 7 and uses an app named "wordswithfriends". Basically, an international scrabble game. It was shutting down unexpectedly. He deleted all Safari History and I don't know if that was a help. However, after many discussions, he told me that anytime 2 different ads came up (wanted to use as a freebie) that was when the Ipad shut down. Those are no longer popping us and so far so good. Two ads (he can't remember what they were????). I don't use an Ipad so I have to do this second hand. Getting other ads and so far no problems. Thank you for this forum.