There are some timeout errors in the diagnostic logs from your Core when it’s recently attempted to update, matching your original report. Additionally, the logs show some unexpected errors around image downloading, as expected from your screenshot.
My guess is that some network settings changed on your router, perhaps after an automatic firmware update, and something is now interfering with your Core’s connection to our servers.
To verify, your Core is hardwired via ethernet to the router, and not WiFi?
Do you have any additional network hardware in this setup, like access points, powerline adapters, additional third-party routers, etc.?
If your Vodafone router has a GUI for adjusting settings, check to see if there are any security settings enabled. It’s also possible there are issues with DNS, since you’re using the default DNS options from Vodafone and our users have experienced issues in that circumstance before.
DNS is something you would be able to change in the graphical interface of your router I mentioned above. If you’re unable to adjust any settings on your Vodafone router, I suggest investing in a third-party router to expand your networking capabilities, as in-built settings may be the issue in that case.
Please let me know if I can clarify further, and we’ll be here to assist.