Quoted from dmacy:

May be simple. Take a few good pictures of the switches. I'm wondering if the wires on the ramp switch is touching something they shouldn't. Sometimes the screws that hold switches to brackets are too tight too and cause switches to not function essentially locking up the mechanical plastic in the switch.
Also you can adjust the captive ball switch. I'm guessing the switch may be touching all the time making the closure and needs opened a bit. They make a tool to adjust easier but a small pair of needle nose pliers will work. The target switches are pretty basic. It will take some gentle tweaking to get the gap right. Turn off the game and remove the two screws holding that left captive ball switch in. See if there's any touching. You want the contacts close with what I use is 3-5 business cards thick (have tons from my work and never hand mine out!) for the gap. If you can keep the switch from touching anything you can turn on game and test. It's a bit of trial and error but is good first things to learn and get your game playing nicely. You want the gap open enough to not be closed but close enough that a light hit of the ball will register a hit.
Pics would help people possibly see some issues. Since you're new it may help to look at the easy things first like the diodes on the switches touching something they shouldn't, etc.
Of course both switches could be bad too but mostly I've found that adjustments are needed.

Quoted from dmacy:

The captive ball hits a target. With the game off, it's easier to unscrew it from the bottom removing the two screws and then inspecting the wiring (Making sure nothing is touching where it shouldn't or wire or diode not broken off) and then check gap. Likely a wire is touching for that or the target need adjusting so it has a spacing so its not showing closed all the time.
As for the ramp switch, as far as I can tell it's ok. You can try using a small screwdriver and loosening the screws to the mount and also try the switch then. See if its sticking. Otherwise, a new switch will likely be needed if you can't follow the wiring below and make sure they're not loose or broken somewhere. There's a bunch of connectors below and there may be a loose or bad connector.
I'm not any help of a label to fix the Multiball.
LOL at your wife. "Tinkering" as she calls it is how you get your game working and 100%. It's part of pinball ownership.

Quoted from toyotaboy:

Every pinball owner should have a meter, and you don't necessarily need to buy an expensive fluke. You can buy a pretty nice meter for almost nothing. This is the one I have:
amazon.com link »
Ronnie is telling you to buy a meter because usually when things start failing like you describe, the voltage is dropping (so you get a weird sometimes works, but not completely), then finally fails. There are voltage regulators in every pinball, and it's basically testing of those components to find out what failed (quite often it's the 5v line going to logic). If you aren't already, I would subscribe to pinball ninja's website ($20 donation, google it). Clay harell has hundreds of videos, everything from mechanical to electrical issues. Even if it's not LAH, the same problem occurs on many other titles, and you're likely to see similar issues to what you see on yours.
I'm all about supporting pinball techs, but it can get REALLY costly and I only use them if I'm absolutely stuck, and I usually wait until a couple of my pins have issues to make it worth it. Truth be told, by the time you pay the $80+ travel fee, and an hour of labor, you can usually just buy a new board and sell the old one off to let someone else fix it for the same price. The other option is to go to a pinball show and bring your board (s) in and let them put it in a test fixture to find issues, at least then you save the travel fee and they'll do a much more thorough job.

Quoted from madmatt1:

That is odd. That has not happened to me.. yet.
Are you sure the ramp is installed correctly? The 2 screws on the back-side of the ramp, are they holding?
Maybe the rivets are too high? Or the wire-frame is bent up?
Well good luck.
MM
OUT

Quoted from caker137:

Mine had this exact issue too. I ended up taking the wire form loose and tweaking the metal a little bit to force the plastic part of the ramp down slightly at the junction. Problem solved. I don't remenber 100% but I think I bent the support that attaches by the eyeball targets to put a counter-clockwise twist into the wireform as it passes over the chicken scoop.

Quoted from TheCapn:

The lane changer is too high. Lower it to where it would touch the outer most equator or lower portion of the ball. The lane changer being too high can slow the ball and even bring it to a halt.

Quoted from caker137:

Yeah, its kinda hard to describe. The wireform (that rests into that plastic ramp) bolts to the playfield in two places: near the right inlane, and near the eyeball targets. If you bend the wire that attaches near the eyeballs so that from the front of the game it bends slightly to the left, this will cause the wireform to press down on the plastic ramp up at the far end of the wireform, which lowers it slightly to increase the slope in the plastic ramp exit. Another way to describe it is that the wireform metal wire that bolts on top of the eyeball plastics starts as a vertical line |, but you bend it to resemble a slight angle \
Do the bending with the wireform off the machine, and only bend slightly.

Quoted from Taygeta:

Question on LAH. Mine had the post holding the plastic down near the diverter on the ramp loose for a long time, causing the diverter not to fire properly.
Fixed that and tightened the post down, now ball hangs when going down the right path. Where the plastic ramp meets the metal flap before going down the right ramp.
Anyone have this issue before? I think my game needs new legs and I know it needs a flipper rebuild and hope that will alleviate the situation but was curious if anyone ran into this issue and had any advice.
Also temp storing my games at a friend's house due to a move/have yet to build a game room. Hadn't played LAH in months. I miss it, without any sarcasm I truly think it is one of the best games from the 1990s, regardless of manufactorer. Awesome modes and cheesy music/callouts. Most undervalued game today imo.