Suddenly printing Random lines of black and white squares

[Unit_10]

Printer: HP Officejet Pro 8620. - Wifi connected. AT&T Arris BGW210-700  (Printer &  router in same room)

Problem:  Printing random blocks of random black and white squares instead of normal text. (See Pic)

After working properly for months,  last week the 8620 starts printing horizontal blocks of random black and white squares instead of normal pages of text.

Note: Several odd facts discovered.

The HP 8620 is listed in the routers DHCP client list as Active....  yet, the HP  IP update utility cannot find the printer at the IP address listed in the router.    Also doing a PING of that IP does get a quick reply.

Temporary solution: Rebooting the router (AT&T  combo modem& router) fixed the problem for 3 days.

Then today it's back to printing random blocks.  Again rebooting the router solved it.

2nd Note: During the time that printer was misbehaving everyone else at home on Wifi ( tablets , phones, Roku and laptop) all had no issues with Wifi, just the printer.

I thought maybe it was an IP conflict between the printer and another device but can't find any evidence of that.

Any thoughts would be appreciated.

Rob

[ShlomiL]

Hi,

This is unlikely to be caused by any IP conflict, a such will occur immediately and not after a few days of usage.

Open the Setup menu from your printer front panel, select Network and then Print a Wireless Test Report.

Please privately share the report, to evaluate any possible cause within your network configuration.

Regards,

Shlomi