why performance increase after pause?

Timrhu, send me a PM!( It'll be just between you and me)

Voice coils cooled down?

Maybe not the same subject matter, but I've noticed that if I load a cd twice it seems to sound better.
I don't know why, but it does.

The voice coil theory is plausible I suppose.

Maybe the wires "relax" and the re-surgence of electron flow re-establishes the path as fresh. Maybe not just the wires but everything in the signal path as well benefits from a pause. I haven't ever noticed this phenomenon but haven't ever listened for it either, but you have me curious. I will say that the second side of an LP always sounds better after the cartridge has a warmup period.
Are you just noticing it on you CDP? Could it be clocking related? Just some random thoughts...but, isn't that what forums are for?