Are you sure you're losing your network or just Internet access?
If it's Internet access (which you can check by pinging your modem and getting a reply) check that your modem is set to be connected at all times, not 'dial on demand.'
i had that problem on a very old laptop which was on all the time and i just put it down to ageing as it seemed to get worse. bought a new laptop now ... not sure if ageing explains it ... how old's your computer?
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