I couldn't quite tell from the post, is it pulling the cable pretty tight? It sounds like overcurrent, does the J4 stepper driver have a blinking red light when it happens? If so, it'd be a pain, but replacing that cable with one six inches longer might be the easiest path to take. Could try taking ohmmeter readings of both phases to make sure the impedance isn't getting too high, but it only sounds like an issue at that one angle.

I had the same issue, tried using an epoxy and it failed. I made some small 1/2 aluminum channel brackets that have worked very well to support them.

Installed the Encoder library, deleted the .ino file and pasted a fresh downloaded file into the project folder, and it compiled for both teensy and Arduino sketches. Thank you so much!

Hey Chris, I had tried it with just copy/pasting the "Encoder.h" and the other header files into the libraries folder. But it looks like that doesn't actually install it. Will try that, thank you!