sounds to me like the 'lift interrupt' is enabled due to low battery
what is happening with the BDI?
what state of charge is it showing? showing low?
is the BDI flashing?
most electric lifts do this when the battery gets low to warn you it needs to be charged, the lift function is disabled to allow you to save enough power to get to the charging station and charge the battery.
Try giving it a good charge cycle and see if that corrects the problem.
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