Is it always the same bumper?

I'm thinking a switch matrix problem involving the lane change switch on the right flipper button. Would help to know specifcally which bumpers are firing.
Usually matrix sneak paths are caused by stuck coin switches or shorted coin switch wiring.

First, change the switch capacitor on the pop bumper, as they age, they sometimes trigger all by themselves or even tap out a little beat.

If the MPU board is covered in black dust/soot, run it in the dishwasher on "pots and pan scrub" cycle. Some have reported that this fixes it.

If you end up doing a playfield swap on the game, put the whole harness and mechs in the dishwasher and get rid of all the conductive carbon stuck to the plasticizes on the wires.

https://pinside.com/pinball/forum/topic/cleaning-playfield-harnesses-vids-guide

Can you explain the expected behavior difference between having fresh new ones and having nothing at all. (clipped)

-mof

Removing the capacitor can mean that some quick closures don't register, but if the capacitor was the problem then it would stop misfiring from the flipper

The cap lets the CPU detect quick ball hits that would otherwise be missed.

So you get more action by having the cap properly installed.

If you have a bunch of people over and the pop starts going "tap - tap - tap - tap" all by itself, you would raise the playfield and snip one leg of the cap - but to restore the gameplay back to normal, you need to replace said cap.