Microsoft is taking its time with the boot certificate rollout, but you don't have to. Activate the latest UEFI CA 2023 right now.
Android Auto disconnects are usually solvable once you isolate wired vs wireless. Start with cable/port checks for wired issues, rebuild pairing for wireless issues, and ensure battery optimization ...
I finally made the move to install Bazzite on my ROG Ally recently, and I can't imagine playing this Steam Deck rival without it going forward.
You mightn't think it, but the Windows 11 Recovery Environment is genuinely powerful.