Awesome game, 1 problem though

One of the best games for iPhones, period. Would get a five out of five, but the game keeps losing my progress. I finish killing a boss, then get a new character to play, and then stop playing for a bit, and when I come back, I lost the character I earned, and all my progress! Please fix, I love this game and this is frustrating

Jordan...YOUR #1 FAN about Wayward Souls, v1.22