Plowboy,
I'll add to John's questions here. I own the same machine. Try a new cable liner, clean the machine, check your rollers. These have a very low duty cycle. Are you over doing the machine? Check all your conections too. What size wire and who makes it?
I have seen the wire get magnetized and pick up dust & grinding burrs from the job and raise havoc on these little machines.
Good luck and let us know!