RE: Trigger Problem
Have you tore the bolt out and realy cleaned every thing .Take the bolt apart and clean everything ,the owners manual will tell you how
Take a tooth brush and clean the locking lug and bolt recess.
Litely oil and reasemble and try.
Is it happening if you slam the slide home ,close it easy or all the time ?
Is it happening with all shells ,1 brand or reloads ?
BEST BET it is dirty !