RV slides stop and start while retracting

[Tcquilter]

My biggest dread every time it’s time to move to another RV Park is closing the slides. I’m always afraid they won’t work. We have a 2014 Montana that we bought used in 2017 and was used for only 6 weeks by previous owners. We started traveling last year for 6 months and are now on our west coast tour. Today as I was closing the slides, the kitchen slide worked fine, but instead of the second slide automatically moving, nothing happened. I let off the switch and tried again. It started to move in, stopped, and again I let off the switch and it closed all the way. The third slide did the same thing. Is this a battery issue? We were connected to power outside and the battery was replaced two years ago. Joe keeps up with battery maintenance. The slides sound fine when retracting, but it seems like a power issue. Any ideas?