You don't say what netbook you have, Yugi006. Some of the earlier Acer Inspires were known for having funky wireless issues- but this doesn't sound like that, honestly. It sounds like a driver or sound h'ware problem.
Couple of other things to test:
turn off your onboard sound in the BIOS , and see if the problem persists.
as Mercurio said, definitely be sure you have the most recent manufacturer drivers for sound and 'net both. In fact, for everything, because stuff synergizes oddly some times.
Logitech makes a pretty cheap USB wireless sound & headset combo- IIR, I paid less than 30 bucks for it when I upgraded my desktop vidcard and suddenly had no slot space for a standalone sound card. Turn off onboard sound, plug in the USB stub, it should auto-recognize, and see if you have the same issue.
Does it happen if you stream from an optical drive, like a DVD?