Does your Librem 13 v2 have an HDMI port, and is that the display cable you’re referring to? I have a Librem 15v4 and I use the HDMI port to run an external monitor. It was making intermittent connection, so I bought a new HDMI cable, but that did not fix the problem. If I accidentally bump the HDMI cable, it will almost always lose the video signal, so I have to wiggle the cable. I’m wondering if it’s a loose connection where the HDMI connector attaches to the motherboard.
I’ll make a separate Librem 15v4 post about this, but I thought you might not see that, so I’ve posted here.
Edited: separate post just made.