Quoted from LOTR_breath:That is very strange. I would try doing a factory reset. If that doesn't fix it you might try reloading the 1.80 code, if that's possible.
My guess is that there is a new 1.80 bug that corrupts the RAM in a specific way. Fun fact about SAM; when the RAM is corrupted, neither a full reset, nor a code reflash is likely to clear it out. In those cases, the only way to clear it is to power it down and pull the coin battery. However, the residual voltage left on the chip keeps the memory alive for DAYS. If you find yourself in this situation, the solution is to short the VCC pin on RAM chip to ground using a couple test clips (with power and battery removed of course).
I know this because the first total light show board that I added was faulty and would corrupt the RAM on the first power on. The game would behave really wacky. In one case all switches reported to being faulty. Every single one of them, even though they would pass individual tests. After replacing the CPU board, it would seemingly play fine, but in the middle of a game, the score would start freaking out (flashing random numbers) and then jump to some ridiculous score, like 61B or something. It took quite a while for me to figure out what the problem was because pulling power and the battery did not change the behavior. When I checked voltage on the chip, I was surprised to find that it stayed above the min storage voltage (2.3v IIRC) after 3 days on the bench.