Main Slide cutting out

[bungi]

I have a 2008 Montana. Both slides go out with no problems. Bedroom slide comes in with no problems. While main slide is coming in it cuts out until I release the switch and depress it again.
Cheers

[JRTJH]

Welcome to the forum. I think your slides are hydraulic. If that is the case, check your hydraulic fluid level, it's probably low and the pump is cavitating, when you release the switch, it catches up and works until it cavitates again.