Ethernet stop working and work back after a reboot

Hello,
Sometimes, may be one a month, I got a problem with my network, suddenly I can no longer ping anything on my network while the network configuration on mac os x is still fined (ip configured, ethernet link is up, ...)
I tried a lot of thing to make it work back : complete network reconfiguration, putting the interface down then up from terminal (with ifconfig), unplug & plug the cable... nothing work.
The only way to make it work back is to reboot like if their is a bug in mac os x or like if the ethernet controller is freezed and need a reset.
Had anyone already heard of such problem ? I'm wondering if this doesn't append when the CPU is under a high load, so the mac is quite hot, may be to hot for the ethernet chipset ?

I am having the same issue. It's been happening more frequently to me, about once or twice a week. But everything else sounds exactly the same.
Any help anyone?!?!?!?!?!?!?!

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