The machine stops retracting the snake. Extending the snake works fine

When using the General Drain Cleaner Speedrooter 92R

The General Speedrooter 92R Drain Cleaner is an auto-feed drain cleaner 100' x 5/8" from General Pipe Cleaners. Released in 2010. Model number: HDPS92EO.

The snake extends just fine but the retraction of the snake often stops completely. What is needed to be replaced to correct that problem?