Hi
I've just noticed this problem too, after the last software update (not that I load every release, and I haven't listened to many albums all the way through lately). Track volume varies. I'm using Classical mode, Random Off. All albums are 192kB MP3s. I'm using the Line output, so not sure if power amp would affect that. It seems to me that it doesn't always happen on every album I listen to, so maybe if Martin only listened to one he won't have heard it. I'm not sure I've been able to heard it on tracks found using Search on the remote, only on albums selected using the GUI, and only on the last track, and I've tried quite a few, starting the album then picking the last track using the GUI and skipping to near the end to save time.
Regards