NHTSA Complaint #11688801 — 2023 GMC SIERRA 1500

This has now happened 4 times and I'm taking the truck to the dealership to figure out what the issue is. At high speeds, 65 to 75 mph, on the freeway, the rear brakes suddenly lock up for no apparent reason. Extremely dangerous for myself and surrounding vehicles, especially behind me. The most recent incident pretty much gave me whiplash because it's unexpected with no warnings whatsoever. The freeway was clear, with light traffic. I was almost rear ended because the vehicle behind me had no reason to believe the my vehicle was going to suddenly come to an abrupt stop. I looked up any known similar issues for the 2023 model, and found that there GMC did a recall for similar issues on the up to 2022 models, but that the issue had been resolved. Obviously it hasn't.