Referees do not stop the clock in club games, only college and HS stop the clock. In club games the referee, if allowed by gaming rules, can and should add time to the end of each half.
There not supposed to but they do. There is video from this Sunday of the CR stopping his watch and indicating to his AR's to do the same on an injury. In the other game the Ref might not stop his watch but clearly indicates to our coach that he is adding time. Regardless of whether it was added or stopped both games were runnning clock and went 1.5 minutes over. Not a big deal but it happens.