In the past couple of weeks I have noticed that, in my 2016, the driver is unable to control the three other windows (it worked fine in February when I bought). Each passenger is able to control their own door. The child-lock feature is not the issue. I brought it to my dealer who checked the wiring harness and found nothing wrong. He is replacing the wiring harness and a control module under the dash (instructed to do so by GM). Does anyone have a similar experience? Are we overlooking anything?