Freezes When Browsing The Web

Using build 6801, within 10 to 15 minutes of browsing the web, the system would freeze and needs a hard reset. In addition to the IE8 that came with win 7, I've tried Firefox 3 and the latest Google Chrome all with the same freezing result. And it doesn't happen on the same website.

System is a 1GHz Athlon with 1Gb ram.

Anyone else come across this and found a solution? Thanks.

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