Scanner on PC is unavailable at the moment (HpOfficejet4620 Wifi-connected)

Hello,
I've a HP Officejet 4620 All-in-One connected Wi-fi with an ADSL Router Telecom.
Sometimes, on PC appears the message "Scanner on PC is unavailable at the moment" and the printer doesn't print or scan on wi-fi modality.
To restabilish all the wi-fi functions, I've to switch off and switch on after few seconds the printer.
The PC is allways connected with the wireless and the signal from the router is allways good. 
Why my printer disconnected so easily ?
Thankyou
Davide

Hi there @DavideHP4620 
Welcome to the forums,
I am unsure as to why your printer is consistently disconnecting from your network however, below is a guide that will show you how to assign a Static IP, which should help stabilize the connection to prevent these types of disconnections.
Printer Does Not Maintain Wireless Connection
I hope this helps you
R a i n b o w 7000I work on behalf of HP
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