If it is a hydraulic operated slide then you have a solenoid that is leaking back to reservoir (hydraulic pressure keeps them open or closed depending on which side of piston has pressure)
If it is electrically operated then the clutch/brake system is out of adjustment or is worn out.
Is it time for your medication or mine?
2007 DODGE 3500 QC SRW 5.9L CTD In-Bed 'quiet gen'
2007 HitchHiker II 32.5 UKTG 2000W Xantex Inverter
US NAVY------USS Decatur DDG31