Bernie, you didn't say if there were no changes at all being made, only that you didn't change variations that could have triggered a settings change. If it's strictly a hands-off situation, then you probably have a valid reason to cart the keyboard back to the dealer. I had a similar problem with my first kn6k, and no problems at all with the second one. Murpheys law, right? Even with onboard patterns, changes can be programmed in with panel memory switches using msa, for example, and Technics does like to mix things up with the styles at times. I suppose the more bells and whistles we get, the more problems that are likely to occur.