Same exact problem for me. I will take it to a service center. Based on the number of complaints on this part someone should look into the problem.
I purchased a new 350BT backpack blower and the clamp on the control handle was broken.It didn't make sense to send the product back as it was a special order at Lowes. I would have hoped that the Husqvarna site would have been able to provide a new clamp.