Quoted from System-J:Hmm, interesting. Have you had similar lockups on other spike2's? I wonder if anyone has used a separate (off board) led replacement and if they've had any resets.
Though as much as I want to blame a power surge or over heating, that the full reset only happens during tpmb makes me keep going back to the code. If it was a power issue you think a 6 ball npmb would crash once in a while. But, to counter point my own opinion, I find it interesting that there's no shaker motor use at the beginning of the tpmb either, which makes me think that they are avoiding add any more power to it. ...but then, also, they still have rumbles for jackpots, so who knows. <shrug> . Whatever it is, I really hate its an issue still. It's such a great game yet it's such a sticking point and focus for so many people still.
I had a different problem - the woofer chip (TPA3123D2). It was fine when first turned on, the pin would be forever fine. Turn it off (let the supplies discharge), then on - muted bass. The backbox audio chip is the same, but being farther away, didn't seem to be effected as much. Let the pin (Munsters) cool off and turn back on - all good. I replaced the woofer chip (I know to solder SMT parts). So just a WAG it's not the audio amp, but a part associated with the the woofer amp (i.e. a critical cap that's not stable over temperature). The amp is a Class-D topology, so a little bit more going on inside the chip than just a straight amplifier.
Then I started started to turn down the LED's and even printed 3D a CPU board fan, those things helped lower temps a lot. I'm aware of other Spike 2 CPU boards that have the same issue. Not many, but some. In the end, I didn't have time to chase it down (wife reminded me I should spend time playing them, not going on a wild goose chase), so I ordered a new CPU.
(BTW, I'm a retired electrical engineer.)