I used to believe that a properly configured Arch Linux setup is super stable, until one day when I upgraded the Linux kernel and there was multiple GPU hangs and graphics glitches. It's fixed upstream now, but it does make me think again about running close to the bleeding edge.

On the same line, I don't realize that my Bluetooth driver was broken until I checked dmesg. This one wasn't fixed upstream yet, but I don't need Bluetooth on my laptop anyway.