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HP LaserJet Pro 200 color Printer M251nw

Laser Jet Pro 200 color M251 nw UPD PS.  Persisting "79 service error' during attempts at wireless printing.  It just does into a death loop where it keeps rebooting itself continuously.  I have restarted, plugged into wall socket,  etc.  The most helpful thing I did was to switch wireless to 'off' and use an ethernet cord directly from my computer. but it still goes into the 'death loop' but only occasionally.  When I print a wireless report when it is switched 'off', the report says it's 'on'.  Firmware date code is 20150212.  When problem is active, the wireless test report troubleshooting section says the WPA authentication on the printer was changed from it's default.  Not sure how, not sure how to make it default, or what default is.  The only that might preceded this was a new router installed.  Very frustrated.

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