Bedroom slide moving out by itself?

[jp21]

I have a 2012 Montana 3000RK,and the slides were out for about a month during a cold spell.I closed the slides after the snow melted.Now the bedroom slide above the fifth wheel hitch slowly creeps out until it is halfway extended.I contacted my dealer and they suggested opening and closing the slides 10 to 15 times over a few days,and hoping this will purge the lines.This doesn't seem to be working;the slide continues to open by itself.Does anyone have any answers or suggestions? Thank you.

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