Did it used to work, or has it been broken since you got the machine?

I would check all the relevant switches in switch test, as a first step, to make sure the machine is getting all the feedback it expects.

In some cases, the machines react very well to broken switches, playing almost like there was no problem ("self healing", a feature midway promoted heavily in the 80's), with just the credit dot and subtle flakiness to alert you to the issue.

Lawlor machines, unfortunately, do not seem to be very good at this, and will often get very confused when there are bad switches. Every Lawlor machine i've gotten to know has behaved miserably after a mechanical or switch failure, acting in ways that could have been prevented with defensive software. NGG won't figure out when it can't get the ramp up w/out the gopher, despite this being very common, a dodgy lock switch can confuse whirlwind (see other thread here), and confuse TAF even worse (I swear, the other day, I locked 10 balls without getting multiball - kept kicking them out - and had 2 balls on the PF during single ball play for half of the last ball, which lasted forever. If only I played that well when it was working 100%!).