Dealer says...

They told me they could confirm on FOB was "erratic" and would not consistently handshake with the car. Unfortunately, they need to order FOBs because only GM can cut the flip out key (that I never, ever use). So they released the car back to me and identified which FOB worked and which one to bring back when the replacement comes in. Worked fine on the way home but we'll see. I had experienced trouble with both FOBs at one point, though I have no way to know which one I had been using mostly and which had been sitting on the shelf for Bob to use occasionally.