I just posted a question to Stevenast. Perhaps you can give a comment or suggestion as well? Thanks in advance!
I find the screw type connection holding the cable running from the display is a problem for me even when screwed in well.
My solution was accidentally discovered after many other attempts. I keep the connection in a vertical position now, because it is against a bright headlight I've mounted on my front handle bar. The vertical position with the natural curve of the cable seems to keep enough compression on the connection to keep it working. When I do get an error 13 often grabbing the connection while pedaling is enough to restore communication. I did try multiple other solutions (taping the connection, complete replacement of the down tube wire, replace display female connection, ...). About the only solution I didn't try was dielectric grease in the connection. If anyone tries that I'd like to hear the result.
Of course other issues can result in an error 13. This is just I how happened to solve my problem.