I have never heard of that in handguns
1) follow through longer. It might be slapping back atcha because you're relaxing just a split second too soon.
2) rough edges anywhere? File 'em down.
3) reposition your finger on the trigger. If you normally place your finger low on the trigger, place it higher up. If you normally go high, try moving it a bit lower. Use more finger or less finger. See what works.