Headlight high beam shade flickering on its own
 

I have a ‘15 gs 350 f sport with 66k on it. Just had the headlight assembly replaced with a new one due to this issue and it came back. It’s the left headlight and the high beam will flicker on and off randomly and sometimes will stay lifted.. it’s not all the time. From my understanding there is a shade that lifts to activate the high beam and it’s doing this on its own on the one headlight. I’ve changed bulbs and had it covered under warranty with a new assembly and still no luck. It’s embarrassing.. Any thoughts?