It happens without any reason

Every time I login to any server my game crashes. When I'm playing the server it crashes at that time to and when I get killed by a player my game freezes and crashes. When I apply a random pvp texturepack my game gets stuck at loading resources and then crashes. There is a server called nethergames when I click that server when it's loading it crashes,  hopefully you can fix these crashes soon!  I’m on mcpe.