Agreed, when you get to the point that you need about 8000 diamonds for an upgrade between attacks that have access to all your gems, not just what you haven't collected yet which was clearly the original game intent, but on your attacks, it's common for me to get 4 or 5 opponents in a row with 1400 defense which I can't…
Really common issue, you get to 25 points per pvp, do a few and then it locks up on loading the next one. You lose the turn and reset to 1 for pvp points. Pretty much ruins the game. It needs to be changed to not decrement those values until the fight starts.