You may have a hooked tooth or a bent tooth or two tighten your blade more than you would when your sawing and slowly turn the blade looking down the side of the blade to see if you have some that are layer out further than the rest if there is that blade is done
To see if you have a hooked tooth look at each tooth to see if they are bent down at the tip if so you will have to file it down more than normal to get rid of the hook also feel the side of the tooth to make sire you can feel a edge there as well as on the top edge of each tooth
More than likely tho you have flattened out the angle of the tooth and need to increase the angle so it opens up the tooth for a bigger bite