I just unboxed my Elvira HOH yesterday, and it often thinks a ball has drained and gives me a free save ball, so I have 2 balls in play. Stern Tech thinks it is the Opto board on the ball trough. Anyone else experience this problem?

I replaced the Opto boards, and everything has been re-seated (Problem still exists). I cannot get vibration to set off the trough. I now think that the issue is in the rollover switch in the outlanes. Elvira will launch a save ball as soon as the outlane is hit, before the ball registers in the trough. I tested all of the switches by hand, and they are extremely sensitive. Even a kleenex can cause the switches to close, or just barely moving them right or left. There were soldering issues on 3 of 4 of the inlane/outlane rolloevers. One was put in backwards (Solder on unused post), One has solder spray all over the wire (Tiny silver beads), and the other is a poor connections. I need to figure out how to de-sensitize the rollovers. I think they are affected by the ambient temperature since they are a long thin wire and the CTE will cause them to lengthen and shorten, changing the force required to activate.

So it was indeed the roll over switch, for the right out lane. The switch would go off if you even touched the wire underneath. I removed the switch, and it did not have a definitive click for engagement like most other switches. I made a temporary adjustment to the switch to make it less sensitive, and ordered a replacement from stern. No problems since the adjustment. Since I posted I also noticed that the shooter lane is chipping. There is an air pocket in the shooter lane. Stern is sending me a fill kit for the chip, a new switch, and a shaker motor for all the trouble. (I didn't even ask, or get upset). I will say their customer service is Great, but that ends when the warranty ends. At which point you are on your own.