It sounds as if your problem is being caused by the motor being 'back driven' when switched off. Possible solutions:-
1) Don't turn the motor power completely off - reduce the power level to the point where everything stays put.2) Implement a lock or latch that engages to hold position
3) Use gears with higher friction to drive things up and down - for instance, worm gears do not usually suffer from being back drivenHave fun ! Dave
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