The F44 error code on this type of dryer indicates a blower motor control board failure. Since it happens only occasionally, then you could have a loose wiring connection or a partial obstruction in the blower housing. Complete details of the troubleshooting for this error code are included in this link of a previous answer: What does the fault code F44 indicate on my Kenmore Elite Oasis dryer?
I recommend that you unplug the dryer and check the wire harness connections if you are confident that you can safely access the internal dryer components. If you find a loose connection, then tightening it or plugging the harness securely into the connection will likely correct this problem.