Winamp \ Sound And LAN Stop working after some time.

Hi all,

I have just assembled a new pc.

Its specs are as follows:
Asus P4P800 Dlx Mobo
P4 2.8Ghz 800Mhz Fbs
1G DDR400 Kingston Value Ram
Asus V9520 Vs. (Geforce FX 5200)
Creative Audigy 5.1 Sound Card
Trendware 10\100 Lan Card

I am running Windows XP Sp.1

When I leave the computer on for some time, like 5hrs on internet (Via Lan) and playing Mp3s using winamp, the sound stops, winamp freezes at the position it is, but doesn't crash. Also the LAN connection (& internet through gateway) get disconnected.

Any Idea what can be the fault?