Quoted from TomGWI:
We noticed this yesterday on our game. I let the ball dead bounce from scoop.
My son holds the flipper up to try and catch it. He was complaining the flipper was dropping. I took the glass off and checked the EOS switches which seemed fine. I then went held in the flipper button and gave the flipper a push with my other hand and it dropped back to rest. So I agree the hold power seems weak.
I also had a weird problem where the upper flipper randomly does not respond. Only happened maybe 3 times. I was going to check out flipper button today and see if it needs adjusting.
Part of the problem is (apparently) that my whitewood doesn't hit the flipper on a scoop eject - it hits the in-lane wall, so I don't have the same situation you guys do to compare it to. Obviously the short term fix would be to turn down your scoop eject power so it's not such a hard hit to the flipper.
I was originally controlling the flippers in the same way TNA did, but TNA uses different coils (which I had on my whitewood). When I got the right coils, I adjusted how the flippers were controlled and based on testing on my machine, the hold strength increased a decent amount, and the heat buildup was somewhat reduced.
I experimented with some other changes in the more recent beta builds (after 06.05) but ended up reverting those after feedback from testers said they weren't better.
If everything is working the way it's intended the game should increase the power to the flipper a bit when the EOS opens if the flipper button is still closed, for a short period of time, to get the flipper back into position. I will do some more experimenting on my end, and possibly make things more user adjustable.
One thing to check is make sure your EOS switches aren't opening too late in the down-stroke; I'm not sure how they're adjusted from the shop. They don't need to be super hair-trigger close to the end of the movement, but if they're not opening until the flipper is pretty far down the game probably isn't reacting fast enough. It may be that if the flipper is too far down by the time it tries to recover the power increase isn't enough (which would be where the user adjustable bit might help).