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My name is ***** ***** I am a professional here at Just Answer. I noticed that your question was not getting a response and thought I would see if you still need help with this.I apologize for the delay and I hope I can still assist you with this here.
This can be due to a fault with the motor that operates the top itself as I have seen several of these become weak over time and usually when it is trying to lift the top it is struggling the most and can cause this fault here.If you see no components that are binding or catching and it opens properly I suspect this is the case here on your model and the lifting motor may need replaced.