There was an infamous mistake in one of the harmony voices on PSR2000, the Squeaky Mouse I think. Probably was not important to most people but I had a specific use for it, and it had worked great on previous models.
Yamaha vehemently denied there was a problem. After months of my phone calls and emails, they sent an extensive workaround to me so I could use it. They still denied there was a problem though.
It's all about the dollars. If that comes at the expense of the customer, so be it.
If it weren't for Steve Deming, they wouldn't have anyone in US support that would listen to us as far as I can tell! And his hands are evidently tied by Japan in many cases.
DonM