I don’t know if it’s the weather or if it’s the environment or the sunshine or the atmosphere or the electromagnetic activity from the Sun volumio is on volumio is off oh wait it’s back on again no hold on it’s offline oh but wait a second no it can’t see the you graphical user interface but wait it’s back online again okay I don’t know I give up…
Sounds like an issue with the installation on the SD card. I’m assuming that you’re running Volumio on a Pi? I have had that many times after an update it reboots constantly and the easy fix is to download the newest image from the Volumio website and re-image your SD card.