I've never found ambient temperature to affect slide out operation; they've worked in temps from 112 to 20 degrees (as long as I remember to knock any frozen snow off the slide out covers so they won't jam). But there have been several occasions where a solenoid either failed to hold a slide in on the road or let one slink out a half inch while in storage. I've found that in the latter instance, simply cycling the slide out a couple seconds and then fully back in fixed the issue.
Sometimes I think a solenoid O ring just doesn't stay seated completely, perhaps from a small piece of debris in the fluid or dryness, and allows holding force to relieve enough for the slide to back off a hair. Brief system reactivation in both directions seems to flush and reseat the seal. Under your step area should be a manifold of solenoids, two for each slide - one for In and an opposing one for Out.
Indeed you may be low on fluid or have water involved as others suggest. But if the In solenoid is not sealing, pumped fluid may be bypassing when it shouldn't. Solenoids can be replaced, preferably in pairs, or new rings can be put in them. I'd also be tempted to tap on them when a slide freezes up. However since in your case more than one slide is involved at one time, suspicion goes to the tank fluid level, then why it is low if it is. It is also possible that if freezing temps were involved, and water is in the fluid like Sean's, ice could have jammed a solenoid seal; but you said temps weren't that low.
BCS can probably tell you where your tank is, but I'd check in front of the steps for the tank, pump, and manifold. Use proper precautions anytime you crawl under the coach. My book says the fluid should be 1/4" below the reservoir cap, and it is Dexron III, but you should confirm that for your model.
Joel
