When my old Epson Workforce printer became erratic, I bought a new one from Best Buy (my four-year warranty on the old one paid for most of it). The Workforce 3640 is similar i many ways, but quite different in others.
The old one would print business cards without a problem. The new one often chewed them up and jammed. Today each try jammed.
I looked at the Epson website to see if there was a recommended paper or other solution. I found nothing.
I asked Best Buy’s Geek Squad (online chat) if there was any recommended paper. I was told to check with a store.
I did another search and found that there is a rear feed. This is meant for single feed of paper or envelopes. See https://www.epson.com/cgi-bin/Store/support/supDetail.jsp?UseCookie=yes&infoType=FAQ&oid=232592&prodoid=6309.
It took a bit of doing to have the job started and the feed the paper, but I got the hang of it. When I did a second sheet just now it was a piece of cake.
I went back to the Geek Squad chat and left a heads up for them. The agent replied “awesome”.
It sometimes amazes me how I find a solution that the “experts” didn’t think of. Of course, I’ve been solving (and creating) computer problems for 57 years. It doesn’t mean I could earn big bucks, but I think it gives me a bigger incentive to find a solution somehow.