I just used all of my stamina in the PVP battles, and when i won the 3rd battle, i got a message saying PVP mode was unavailable. I was forced to restart the game, so when i did, i realised that it used all of my stamina, and i lost trophies for 2 of the battles that i just won, and the 3rd one just didn't count at all...... this happens ....ALL THE ******* TIME!