Xcontroller losing connection

What causes the X controller to lose connection with x carve?

In the middle of a project in Easel.

Usually it is caused by either power drop-out on the USB line or electrical noise picked up by the system.
Try a powered USB-hub and connect to that, make room between power cables and signal wires. Fluorescent lighting can produce electrical noise, household appliances can also do that.

okay thanks. I will give that a try.

Also your computer might be timing out the usb to save power.

Thanks , I checked settings and everything is marked never sleep.

This just started happening on this project.