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The usual cause is low voltage. Are you plugged into shore power or do you have the genset running? Always a good idea when you are opening or closing the slides are these motors take a lot of power to move. Batteries that are failing or have dirty terminals can cause this as well. If your batteries are over 3 years old there is a good chance they are needing replacement. Load testing can tell you for sure. Please get back to me if you need more as please included the make of your slide hardware. Most of these are HWH or Power Gear. Hope this proves helpful here. All follow ups are included in our fee.