FP queues up switch hits and the software will register sounds/scores for targets in sequence. Since it takes longer to play the sounds than to register the score it seems the game is scoring even when you're not doing anything. This was designed that way to make the game more exciting. You can see this in action if you pull the glass, start a game and hit a bunch of switches very quickly in sequence. You will be done hitting the switches and the sounds will still be playing and the game still scoring.

For your flipper, sounds like you need an adjustment/new EOS switch.

viperrwk

Correct. Assuming you don't have a stuck switch, or a switch that is vibrating open and closed a lot (the 1-6 targets are bad for this as they take a beating - try gapping them larger or putting foam behind the target), if you end up with a pile of action the points pile up and are added in series over time.

The reason I heard for this was because in the early SS days, multiple fast switch hits would not register properly, or would confuse the game into awarding stuff incorrectly. Williams came up with debounce coding and scoring algorithims to deal with this, and in order to 'prove' to the player that every switch hit was counted, they counted them up one at a time.

For your flipper, sounds like you need an adjustment/new EOS switch.
viperrwk

Also correct IMO. Your EOS switch is probably pitted and worn, making sometimes good sometimes bad contact

If you go on RGP there was a pretty long discussion amongst several people about 1 week ago about the same problem. My Firepower does the same thing and its annoying as hell. Just yesterday I waxed my perfect playing BLACKOUT and now it too is doing the same thing. Might want to check on RGP for other possible solutions as there were many possibilities and cures given for the problem by several people.

In addition to the EOS switch, it could be a slightly mushroomed plunger and/or a worn out coil sleeve. I had a similar problem on a newer machine, turned out to be the plunger and coil sleeve...