Still need qualification on the "reset"
1 - Is it rebooting, or,
2 - Is it starting a new game
From what I understand, you start a game, the ball is served into the shooter lane, then the game resets or restarts.
The Shooter Lane (SW14) is in the same Column as the outhole, Trough Switch 1,2 and 3, Left Flipper EOS and Right flipper EOS
The Shooter Lane (SW14) is in the same Row as Left coin, Left Drop Target 3, Ball Launch button, Enter right ramp $ right drop target 3
None of these switches are near the row or column for the start switch (Credit Switch). If the game was set to "Free Play" and the credit switch was in the same row/column, then that might explain the issue. I've seen this on my Addams Family with a switch wired incorrectly.
I still think it is within the switch matrix, and it will be a miswired switch or diode. Can you double check the orientation of the diodes you replaced, as I think you replaced some diodes in the trough switches and the launch switch ?
From memory, the game serves the ball, and then you hit the "launch" button. I was wondering about the timing of this event. Does the problem occur immediately after the ball drops on the Shooter lane switch ? Or after you press the "launch button" ?
At the start of a new game, do the drop target banks reset ?
You can also check the switches on the drop targets and flipper EOS - looks for a loose wire or a short.