Sometimes when you're in a battle it doesn't let you in the battle a few seconds later and then the battle already started and your pokemon took a lot of damage or died. When you play battles, it sometimes logs you out of the app completely and takes you back to the app store. When you click a type of battle, it will act like you didn't click it and it will take several seconds to load. The game begs you to pay out of pocket to get pokecoins. 30 pokeballs wasted on pokemon. Sometimes more.