Hassio not fully booting anymore?

Hello,

Hope the community can help me out.
Today, all of a sudden my Home Assistant server (Hyper-V image) doesn’t seem to fully boot anymore.
In the GUI the message “Please wait while Home Assistant is booting, not all entities may be available” (or something similar, I’m getting the Dutch message) is visible and most of my entities are unavailable.
Can’t find anything relevant in the logs, the only thing I saw was that /dev/root is at 100% (but read somewhere that this is not a problem).

Does anyone have an idea what the issue could be?

And df -i is showing:

image