Your debug looks normal. However, with the new update, problems can occur with old systems. We are currently developing primarily for the Pi 3 and Pi 4. Which image do you use (wheezie, jessie, stretch, buster)? You can find this information in the Debug Info on the Settings/Reboot page. If you don’t use stretch, please download it from our website and burn it to the SD card. If necessary, make a backup of your current system beforehand.
When the dropsouts occur, is there anything suspicious in the Health Checkeron on the Settings/Reboot page? Please also take a look at the Squeezebox Server log file. Perhaps error messages appear there too.