I have a 2018 Silverado High Country 4x4 with 128k miles. It started to shudder just recently. Definitely feels like the driveshaft is unbalanced, but doesn’t shudder/shake/vibrate all the time. I have no idea what makes it start or stop. I had new tires installed, alignment done and even had the wheels rebalanced. Three different places said the steering and suspension is tight and didn’t find any problems. I’m hoping GM does a major recall on this problem as I cannot be the only one with the shudder/shake/vibration. If it’s the driveshaft, why is it happening after,128k miles?