Ethernet Connect

i have 2011 imac i7, 21' computer. appears ethernet connection fails reengage when starts sleep mode. if turn machine off or restart few times ethernet connection re-engages. wi-fi never problem happens ethernet connections.

not sure if nic or sleep settings.

has else experienced problem?

 

i've had issues imac running 10.7.3 (only after going 10.7.3) , using ethernet. solved re-booting router.

 

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