@Anita27 Welcome to the forum. When I first got Glass I had a no network message when we turned it on every morning and I managed to resolve it by amending the settings in the Startup & Standby menu. Make sure the Networked Standby Mode is turned ON as this stops your Glass losing the network when it goes into standby. If you keep losing the network whilst viewing then this may not be the same issue as you are having but it is still worth changing this setting.
In addition to the advise given by @Mark39 I would also reboot your router.
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