I'm having a very intermittent and odd issue regarding the ball when it enters the jukebox.

For the most part, the machine sees the ball and releases it. Sometimes it's a hard kick and sometimes it barely pushes it out.

Using a pinball, the machine reads the switch open and closed in switch test, and the coil is strong in coil test. I've never seen a problem where this coil doesn't angrily launch the ball out when using the skill shot.

Last night, the ball just stayed in the coil. Machine goes through ball search and nothing. Staring at the ball to see what it's doing or not doing makes me notice the coil is firing but only enough to move the ball, but not pulse hard enough to remove the ball.

I've reseated switch connectors and coil connectors to the jukebox. The problem seemed to go away, but I'm convinced it will return. I've read others having this issue too, but didn't really find a solution.

I've also noticed when the jukebox is lit for song change, that if you shoot it, it sometimes doesn't activate this feature but still releases the ball. So if it's switch related, the machine knows it's there to release the ball but it doesn't know it's there to activate song change? This is the weird intermittent part.

Thanks in advance.

p.s.
The double cannon fix has held up well and works like a charm.
http://pinside.com/pinball/forum/topic/acdc-two-ball-cannon-ramp-fix

Follow up. I have an email out to Patrick at Stern. Will see what he says. In the mean time, I've performed some more tests, which are below. Maybe I'm missing something simple. I can't figure it out though.

I’ve reseated both J10 and J17 for the coil and both connectors associated with switch 37.
In switch test, with a ball attached to a telescoping magnet, the switch is registering 100% before the ball even rests on plunger area, so I can’t see this as the issue.

In game over, glass off, coin door closed, if I drop a ball in the juke, it kicks the ball out about 75% of the time to the right gate, like it should.
The rest of the time it just sits in the juke, or if I’m lucky it pulses the ball repeatedly until it trickles down the left exiting gate.

Any input or ideas? Again, thanks for your time.

Spoke with Chas today who is sending out another switch. He recommended doing a factory reset too to see if that helps. To me, it really sounded like he was hearing this issue for the first time. I could be wrong. Maybe those with similar issues should call Stern and voice their concern.

Has the issue come back after you replaced the switch? After replacing the switch, would you say the kickout is pretty consistent? I'm hoping so, as this is the last issue with this machine that I haven't (yet) been able to figure out.

Thanks