Please help-problem with a Mig Welder

[K and K]

So a good friend of mine let me borrow his barely used Hobart 135 Mig welder. Im just welding some sheet metal, mostly spot welds. It did fine for the first couple days, now a problem I cant trace.
If you do about 4 or 5 spot welds quickly, the wire feed comes to a stop. If you wait about 20 seconds or so the wire feed will continue again for another couple spot welds then stop again. Wait another 20 seconds and it will feed again etc...
During the time that the wire will not feed, the relay clicks inside the unit when you pull the trigger, the fan coninues to run, if you let the wire touch the metal while not pulling the trigger there is a small arc. The white button of the circuit breaker on the rear of the unit does not pop out at all. I pulled the case and the is nothing obvious.
If anyone knows what may be going on please let me know. I will not give my friend back his welder in worse shape than he lent it to me.
Thank you

 

[TozziWelding]

Check to see if the drive rolls are tensioned properly, is the liner clean, and does the tip need to be changed, also check the plug from the gun to the machine.

 

[AZ_Catskinner]

Try swapping the tip - MIG tip quality is suspect these days, most are imported and not exactly precise anymore. If you can find Tweco Eliminators for it, you'll be much happier in the end.

Also, doing spot welds tends to concentrate the heat to where the orifice deforms slightly.

 

[K and K]

No kinks in gun line, liner looks good, it happens like clockwork after a few spot welds it stops feeding, wait a few seconds, feeds again for a short burst. I pulled the board and didnt see any cracked solder joints.

 

[K and K]

I put on a new tip with no change.

 

[knocker]

how high are you running the machine, on the smaller units like the 135 they dont have a very high duty cycle, you could possibly just be over working it.

 

[RangerDaleXp]

Sounds like roller tension or wrong wheel for the wire. you need to check to see if the roller spins when the problem happens by lifting the lid and squeeze the trigger. if the wheels is working check tension or see if you are running the proper wheel......