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1) You can probably save yourself the reboot by disabling and enabling the network interface on the laptop.
2) There's actually a lot of negotiation and possibly re-negotiation with a NIC, on top of sleep/resume behaviours etc. The first thing I would do is rule in or out whether it has to do with sleep/resume being enabled.
3) Next I guess I'd visit the advanced setup options for the card driver, and check the event log.
4) Yes, updating the driver (or even reinstalling) may help.
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