I have seen the auto launch problem, albeit not restricted to 2 player but I bet I know what the issue is. Check that the drop targets (Dead, Pool) or mini deadpool are resetting correctly. If they fail to reset correctly (all up), and for sure you notice this in a 2 player game because someone just knocked some down, I believe the game thinks it's doing an autosave or something since targets are down and auto lunches.
If that is the case you can try bending the hell out of the drop targets forward so they catch on the plastic ledge properly. In my case I ended up getting a replacement drop target for "Pool" from Stern. "Dead" started doing it but some bending worked.
Quoted from bigchief99:Hello,
I need help for a friend/doctor (who does not live close) that only owns a Deadpool LE and is having some trouble with his machine. I told him I would post and ask this question in the Deadpool forum. According to him on a two player game the ball is auto launching for the second player without touching the machine. I don't thing he is having a problem during a single player game( not 100% sure). He is not a pinball tech guy but I told him it is probably a switch or opto. Again I have never been to his house or saw the machine in person. Would a tech error show up in the diagnostic service menu? I have searched a little on pinside and there was a similar problem on a AC/DC Luci where people suggested to reseat the connectors on the drop targets or something(sensitive switch anywhere on the playfield) might be causing it or maybe the button on the lock door bar.
Any help in this matter would be much appreciated. I will check back for updates or people can message me. Thanks again.