David Moss emailed me back with a quickness with the following:
"We've heard of this before - sounds like you have a faulty rotary control.
We'll have to get the player in for service."

Argh. I'm seeing this too and was hoping it's a software issue. It's not bad enough to annoy me yet, hopefully it won't get worse. On the other hand my warranty expires in a couple of days... Best to email support, I guess.

Borislav