Greetings @michelleb84 and welcome to the Community!
I’m not sure if your problem is that the YouView box is working perfectly, but you got this message (in which case it is a temporary blip and you can safely ignore it), or if you have a real YVM102 ‘box lost internet’ problem.
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If the latter, work through:-
https://support.youview.com/youview-box/error-messages/fix-for-yvm102/
which will hopefully resolve it.
But if not, please do come back for more advice!