Check the owners manual or manufacturers website for error codes. Most likely cause...a bad control board.You tube will most likely have "how to replace" videos for your assistance.
Good luck...
The fault often lies with the motor relay because the motor relay should keep the dryer running after you release the push-to-start switch.
The following page has a link to a video providing a tip to restarting the dryer. That said, the troubleshooting page points out that door latch problems can also be a cause of stoppages.
https://www.searspartsdirect.com/diy/symptom/dryer-repair/1234594/starts-then-stops/dryel09
E61 is a stuck relay on the main control board. This is the board right behind the control panel where all the buttons are. You'll need to order and replace this board.
If it were me, I'd probably just clean up the scratches on the pulley and or motor shaft. You can do so with a small file or sand paper. If you believe the friction caused by this roughens is due to the scratches, try smoothing them down. The grooves remaining won't harm the belt or pulley, but raised edges could. When I worked in an electric motor shop, we repaired many a motor shaft by filing the bad nicks caused by pliers and wrenches, with a little filing as the motor turned.
If you have time and don't want to spend money for appliance technician, lookup youtube videos on dryer repair for your model. You will need tools and patience and some help to move the dryer to a place where you can take it apart. My brother did this and was able to disassemble his dryer and put it back together and it works now. Not saying this will be a guaranteed success, but once you have it apart, you could theoretically replace the part that's not working.
