shattering palm client crash

my client never crashed during any most intense moments until today, my new build on shattering palm chaining off the entire screen, the client crashes very often, at least 3 times today, it just froze, jump back to login screen, and when i log back in, the instance is gone, and the earning i made from that instance is also gone, like i never did this instance before. and i lost a divine because of it, it was already picked up but after the crash, it's gone too.