Hi, new to this forum. I have an issue with my Millermatic 180 auto. It migs fine as long as the wire speed is 60 or above. When I try to turn it down, the wire stops coming out and it's still making the sound like wire is coming out, but it's not birdsnesting. The mig gun only has a half dozen uses on it. My friend I bought it from used it exclusively for aluminum with the spool gun. I am putting out more wire than heat, and that's not good for thick stuff. Thanks in advance.