In my experience 99% of the time it is the usb cable. It seems that these usb-b cables are often very low quality, they are designed for printers after all. I have gone through several that look nice on the outside ( thick, shielded, etc) that just don't perform well under constant use. At the moment I'm using one that I picked up from an op shop, sometimes you can get lucky and get a high quality one from back in the 2000s. You could also try the green swamp driver (GSS) see if you get better results. It's a newer more maintained driver for eq mounts.
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