Quoted from paulbaptiste:I have that same problem for drains off the left side of the guitar lock. Consistently SDTM when released. The right side seems to push the ball away from the center while the left is straight down the middle.
From watching your videos it looks like the balls trajectory is changed once it falls down onto that step beneath it. After investigating the issue on my own machine I believe the ball is hitting the ramp support before it drops to the playfield. This is pushing it back towards the middle and causing the drains (at least on my machine).
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Does the ball land on the play field or bump off of something on the way down?