I really enjoy this game. I have played it awhile and I haven't experienced any issues. Today all of my progress on the summer event was deleted and I have to restart my progress on the event. It's not a huge problem because I don't grind this game, but I had 1000+ coins when it reset. Keep in mind this is the only problem I've ever experienced and this is a really fun game. I just wanted to point out this problem so that it can be corrected in the future.