I have a 2018 GMC and the dealer says it's not their problem.
I can be at the same location several times a day and lose audio, but yet the screen still shows the proper information. I have also had the "No Signal" message pop up with audio loss while at a stop with no obstructions around.
The dealer did some kind of repair on a supposed recall on a lose connection in the center console. Didn't change anything.
My research tells me that it may be an antenna issue and am thinking of replacing the shark fin and underlying electronics.
Has anyone else had the same issue, and/or did a new antenna solve the problem?