default gateway is offline. how do i fix this

hi, im using windows xp on my laptop and use a vodafone mobile broadband prepaid usb modem. i have been usiong this for over a year with no probs but all of a sudden i keep getting kicked from msn with default gateway offline message , also i am getting kicked from net as well. any help would be appreciated. it is happening so frequently that i am now resorting to uninstalling my vodafone modem and reinstalling. but it still happens.

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