Can anyone help me I just had a 3280 liftmaster opener installed and I have a couple of issues with it. When it opens and shuts it jerks and when opening the door it is pretty quiet but when shutting it seems noisy, also just wondering if it should be noisy in the room above the opener as mine is. Everything i have read says they are very quiet mine is not. I have had the company that put it in out twice and they tell me all that is normal. I was wondering if the 3850 liftmaster would be more quiet. Any help on these issues would be appreicated.

Margaret