If it is not got a LOT of hours on the bar, or if it's not bent...
The chain may have been improperly sharpened , depth stops not cut right or too aggressive cut angle on the chain ...
I agree with the others and you might just buy a swap out chain... it's nice to have a spare anyway... if changing the chain solves the problem ok if not swap the bar, and you will still have the extra chain...
:smile:KennyV