Removed my 2019 Yukon from Cole Gilmore's (Portage, MI) and moved to BettenBaker GMC, Allegan, MI...after 9 weeks BettenBaker found the drive shaft needed to be balanced but that did not fix the shutter/vibration at 45 mph. Service manager has called in GMC field engineer...now going on week 10!Vibration/shutter start at 45 mph, mileage 38k, problem since new!! Anyone else having this problem? GMC tech is working on the problem, maybe??