The game always jump out, especially when I use my silver and gold key. Waste my tickets. Happen so frequently. Enough is Enough!!!
Message them on facebook.
Babu what phone do you have? I have the same problem with my Iphone 4S… it’s really annoying. I contacted them on facebook and they checked my account and there was nothing wrong with it so it probably is the phone 
Which is really annoying…
This actually might be the answer, because they didn’t increase the monster inventory space because it might cause problem with some older devices they said so there is a huge chance the problem might be the the cellphone other possibility might be a corrupt file of the game (Happen to me on other game), you should contact them on FB maybe they can give you info about what it could be.
Mine is iphone 4
Yeahhh…that’s a pretty old device you got there.
game jump out again when i use 30 tickets!!!
This is going to be a recurring issue for you as long as you play on the iphone 4. It was recommended to me by the devs to make sure you close out all the other apps on your device before playing to free up the most available memory as possible to avoid the crash. I play on an iPad 2 and have that super annoying issue from time to time in the worst possible times like when I’m about to level up and I spend my last few tickets to get that needed experience and then …(an hour later still crying)