On Big Guns, the upper left flipper is staying up sometimes (like 50% of all the shots).
It then comes down after a while (not always) or when the other right flipper is fired (always!).

I thought it could be vibrations from the other flipper making it come down, but not so sure about that since other vibrations on the playfield dont have any effect.

Similar issues has been discussed in the forum, but still I feel it's not really the same problem as mine.

Turning off the machine while flipper is up wont make it come down (stays up), touching the flipper slightly with my finger makes it come down.

I have taken it apart and cleaned the whole assembly, changed the spring and the bushing, but didnt help.

There is a slack between flipper and playfield so it is as it should.

Very strange, what should i look at next??

Can u please explain that more?

Here is another strange fact: although the problem seems mechanical, i can't reproduce it by hand (manually moving it up and letting go). While it happens like 50% of the shots when playing