TR8520 stalls on duplex printing, Windows 10 , PDF or word--Acts like it is losing memory

[PJS1]

Have a TR8520 inkjet which I have used for several years.  It will do a few pages duplex fine.  But on a longer document,  it will stall ( not jam), and then spit out a half printed page.  Then it goes back  as if to start over.

I am trying to do 40+ pages, double-sided document.  Can only do 2 or 3 at a time.  It seems like it loses memory of what it has spooled, and then it stalls for a second, and spits out the half printed page.  This is a PDF or Word-type doc.  Running Windows 10.  Is there a software update for this printer?  Single-sided it can print the whole doc in one pass.

[Patrick]

Hi PJS1,

Are you using your PIXMA TR8520 wirelessly?
Or is it connected to your computer via USB?

[PJS1]

The USB cable had gotten unplugged from the PC.  I plugged it back in but it didn't make a difference.  It printed one page, then the second page it spit out , OK on one side and half printed on the other and went back to the screen as if beginning the job.  The port that it says it is on is a Standard TCP/IP with port name of DE487B0000000.  It prints out the Windows Test page with that port name.