My GOT LE on location has blown 3 node 8 pcbs. I'd be willing to bet that we would be seeing far more failures if there were more LEs on location, but since most of them are going to collectors that level of stress isn't being put on many of them. If the problem hasn't been figured out by the time Premiums hit (which I'd imagine will be more common on location than LEs), we could be seeing it happen a lot more. It can happen on Pros as well, it just doesn't seem imminent like it does on the LE. An op I know down in Portland had one blow on his Pro recently.
To Stern's credit, they are definitely aware of the problem and seem very motivated to figure it out -- they just had me ship my machine back to them to try to figure out what's going wrong. They actually approached me about it and seemed to really want my game to help with the diagnosis. Hopefully a solution is on the way!