VSX-520 + PS3 + Optical: Strange Clipping

Having a strange issue with a new amp. Went from a Quest amp that died to a Pioneer VSX-520. Hooked up the same way, using an optical cable. Everything is working great except for one small thing.

When in the main crossbar of the PS3, normally there is a sound effect that plays when you switch between options, and otherwise, it is silent. If I wait a second, and then try to move between options, the amp won't play the first 1 or 2 sound effects. It's almost as if the optical goes into sleep mode, and then has to "wake-up" to play the sounds. The only problem, is this happens after like, 1 second, so it's constantly omitting these effects. I've tested hooking up the ps3 using analog inputs, and this doesn't happen. It also didn't happen with my Quest amp (not that I'm saying the Quest amp was better...).

It's not really a huge problem, but I'm worried that anything else that starts to play after a tiny delay of silence, might also be clipped at the beginning by a half-second or so. Unless of course most signals would be sending some sort of data during silence to prevent this from happening?

Any info would be greatly appreciated.