2021 Tahoe High Country

5 months ago we purchased a 2021 Tahoe High country . Last week I heard some ticking underneath of the vehicle then the vehicle started shaking and rattling then I had Service ECM, Service traction control, service stabilization and my check engine light kept blinking like there was no tomorrow. I took this to the dealership only to have the left-sided lifters replaced. On my way home from the dealership cruising about 50 mph the vehicle shut down into neutral and on the dashboard it’s stated start engine again. Has anyone else had these issues with their new Tahoe.? then to top it off since the battery wasn’t working they could not put the Tahoe into neutral to tow it, is this normal?