The units with electric motor slides instead of hydraulic ones would have to either strip the gears to open, or somehow have accidental power applied to the motors for them to open, anyway. Mine have never budged in over 2 years, and I have a bedroom slide, and a living room superslide.
/SIGPIC]'08 V-lite Flagstaff 30WRLS
'06 Ram 1500 QC hemi
Reese dual cam sway control,
K&N series 77 intake, Hellwig helper spgs. LT tires,
Flowmaster "true duals", 380 h.p., Bilstein shocks