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I got my 640m this sunday which I purchased after reading its review here(notebookforums.com).I discovered one strange problem is that whenever I take out my DSL cable while the internet connection is on (including browsers accessing some sites) the laptop hangs .I have to restart using the power switch.However this problem does not come if I disconnect my internet connection first & then take out the cable.I think is is abnormal operation.

What is the problem?Can it be solved?
Thanks in anticipation.