I don't have a Cameo but I do have a 2008 Carriage product. The slide control motor is actuated by a slide control box which has connections for the switches and the motors. I also believe there is an adjustment (probably amperage) that tells the motor to stop when the slide is in. My box was hidden underneath the refrigerator. Could be there is extra friction on the slide and the box is telling it to shut down with an automatic reset. Could be a bad box. Trouble shoot by switching the leads on the motor then hit the "out" switch to see if it comes in. Don't know if the Cameo works the same but worth a try.
Doubt that it is the motor. Same motor and gears for "in and out". Polarity of two leads is just switched. Soaking the access zipper with WD40 will help it move but you are still going to break off the pull tab at which time a small loop pick works well. Make sure you have a good battery connected in addition to powering your convertor.