The kitchen and living room slides are hydralic and the creeping out is usually a worn cylinder and/or the anti creep valve. Bad news it tends to get worse over time. It has happened to many of us owners. The bedroom slide, is it the bed or the wardrobe side. Usually the bed is rack and pinion and the other is cable. You might have a misalignment and by pushing it you over come the force to move it. Get it looked asap so not to get stuck somewhere.
For the Kitchen and Living Room hydraulic slides, you should first check your fluid level.
Mine was low about a quart. After adding the fluid I have not had a problem. Simple.
I know this has not helped on others, but worked for me so far.
Note that the slides need to be IN and the jacks UP to check the fluid level.
As stated in another post the kitchen and living room slides are Equalizer slides and hydraulic. It could be fluid level or the anti creep valve. You may want to go to the equalizer web page and pull the manual. Make sure who ever works on it knows what they are doing. You may want to use your slide locks until you get it corrected.
The bed slid if queen or king bed is a rack and pinion slide by Equalizer. The motor loosens and slips down causing the slide to slip. Attached is a picture showing the four bolts that loosen. If lucky all you will need to do is push the motor back up and tighten. On mine the casting broke so I had repair the casting and fabricate a bracket to hold the motor. I think it is a poor design.
Silver; great photos and fixture that you built. I'd like to warn that anyone tightening the bolts, that it is very easy to strip the threads of the motor's housing; which is either aluminum or pot metal. Because the bolts cannot be torqued down hard, they loosen and thus the problem. I suggest that Loctite Blue be used on the bolt threads.
Gale & Hank- 2012 Berkshire 390BH
Thanks IR-V. Mine loosened three times over 5 years even with the lock tit blue. The last time it was hanging and while driving I suspect the bouncing of the motor cracked the pot metal of the housing. When I went to tighten the ear snapped right off. The motor weighs a lot to be hanging by those pot metal ears. In any event as the motor still worked I hated to pay big bucks for a new one. JB Weld to repair pot metal housing and bracket have been in place for a year and knock wood still working.