Greetings,
This one is easy.
Your G7020 is going to sleep after some period of inactivity.
What happens:
The router doesn't hear from the printer and assumes its no longer connected to the network. It reclaims the IP address it assigned to the printer the last time it connected. This is the IP your computer probably thinks the printer has.
Now the printer is needed. When it wakes up, or is turned on again it connects to the router.. the router views this as a new device or connection request and gives the printer another IP, however, it might not be the same one it had before.
The result is "Printer Offline". Running the diagnostics refreshes the connection and now the printer can be used again, until the next time. The same will be true if the printer is turned off for a brief period of time (or days), etc.before being used again.
To resolve, assign the printer a static IP address or reserve an IP on your router for it. This is an easy process and only needs to be done once.
Moving forward your router will give the printer the same IP address regardless of when it was last used, (went to sleep, turned off then on). Your other devices will always know how to contact the printer because its IP will not change.
~Rick
Bay Area - CA
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