Bill,

When you hit 3 subsequent notes in the chord part, the accompaniment stops and starts again with the next chord, but I guess you know that.

Other then that, I would suspect a bad ribbon connection or some cold soldering points, because electronics do either work or don't, they don't alternate in between except for bad or corroded contacts.

At the going labor prices for electronic repairs, if you're handy, it would only cost you some time to open it up and check all connectors (even disconnect and connect them again) and a look for cold soldering joints.

The rubber contact under the D button might be getting worn out and needs replacement or some dirt is preventing a good contact (I once found a squashed tiny little fruit fly under a faulty button in a fax machine).

Gr.
John

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Have a nice day