Consider the crosscutting carefully, especially for larger logs. An incorrect work technique can be dangerous and cause the trunk to split or the guide bar to become pinched. First assess the tension in the trunk. Make it a habit to look at how the trunk reacts to being cut.
You may have misjudged the tension.
Safety when crosscutting
Be aware of how you are standing when crosscutting logs. Stand off to the side of the cut, as the trunk can jump up or throw back. If the ground slopes, never stand on the downhill side and crosscut. The log can start to roll before it is cut through and injure you.
Preventing the wood from splitting
1. Make a meeting cut by first cutting 1/3rd of the log diameter on the side that is exposed to compressive stress, or the side where you expect the guide bar to pinch.
2. Now continue to make a meeting cut on the opposite side until the log is cut through.
Crosscutting thick trunks is facilitated by using a bumper spike. Apply the bumper spike to the trunk. Press with your left hand against the front handle while lifting the rear handle with your right hand.