Same issue here. 2021 Yukon . Had it for less than a week and the lane assist starts acting crazy. It’s been at the dealer for three weeks today. Changed out the front camera but can’t get it programmed. Two different programs and still nothing. Was in the shop 4 days prior to this due to “service safety restraint system “ light. Harness fixed that issue... but they have no idea how to solve camera / lane assist problem.