My Volvo XC60 (2012), when reading MP3 music tracks from a USB stick, is often complaining with a "track unreadable" message. Initially I was blaming the USB stick, but the issue was still there with a different stick, and a PC never had problems reading all tracks...
My garden irrigation was driven by a six-zone traditional controller (I bought one made by Signature a few years ago), where I would use only four zones, each of which with 4 or 5 sprinklers.