Just started noticing an intermittent crackle or pop sound, almost like a static discharge sound, on the directivo audio (digital optical out). I've got a Philips DirecTivo Series 1 receiver running through a Marantz 7200. In particular, I notice this frequently on the DirecTV's local channels (Chicago area). Don't recall noticing it on other channels, either basic or premium. Certainly does not happen with audio from the DVD player (whether PCM or DD/DTS). Anyone else notice this? More importantly, is there something that can be done? Is this a problem with me or with the encoding of the local channels?