July 2014 build here. This one is the least reliable NIB I've experienced. I can't imagine what it would be like if I actually played it a lot.
Oh well. Have you put in a ticket? JJP tech support is really good, although they seem more stretched thin lately.
Did you deal with the inductor recall problem on the power supply board? I wonder if this is somehow related?
https://pinside.com/pinball/forum/topic/yikes-woz-fried-lots-of-smoke-where-do-i-start