I think I saw this same thing just last weekend. I had pressed buttons, like you, but then just power cycled and didn't think twice.

If I remember right though, for me it was while I was FF through a track. I let off the FF and I started seeing that behavior. I hit pause, tried FF again, and skipped tracks. But the power cycle did work.
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-Michael

#040103696 on a shelf
Mk2a - 90 GB - Red - Illuminated buttons