My recommendation is to go directly to Klauber (https://www.klaubergear.com/
) and ask for your options. You will need the motor type and model when asking for assistance.
What you are experiencing is common as the motors reach the end of their life, and if the slide out has not been cleaned and lubricated. Or, when the slide is extended for an extended time in salt air and corrosion sets in.
A good inspection will point you in the right direction.