Same issue with both of my remotes on my new 2019 Suburban bought at the end of June. Worked great for a few weeks and now I need to be within 70-80 feet to remote start or roll down the windows. And many times standing right next to the doors with the FOB in my pocket, can't open by pushing the unlock/lock button on the door handle. Changed the batteries but it didn't help. This morning it didn't even detect the FOB when I went to start the truck the first time. Second time ok.
Come on Chevy/GM!! What gives?!