Madden Mobile-won't load

Problem with Madden Mobile not opening.....The Start up Image comes up on my iphone for about 5 sec then it closes back to my home screen. Ive rebooted, restarted, and checked all other options but cant seem to find a solution. Im also a little concerned bc  i made in game purchase and right after the purchase was complete the app closed and has not responed in a couple days. Thanks for the help