Network connection lost after waking from sleep

iMac (27" late 2013) running Yosemite 10.10.
Ethernet connection direct to the computer from the FIOS router.
Upon waking from sleep, the computer is not connected to the internet.
After about 20 seconds it finally reconnects.
Under Mavericks it never lost the connection by sleeping - was instantly connected upon wake up.
I tried creating a new location under the network system preferences and ordered it so that Ethernet was the first to connect.
That didn't change anything.
Any suggestions how to fix this? I don't want to have to wait every time I wake up the computer.
Really bugging me.

Update on my situation.
I have tried many things to get this fixed including:
SMC reset (for an iMac this means unplugging it, waiting, and plugging back in)
PRAM reset
deleted the "system configuration" folder
Still no luck. Upon freshly booting the machine, it gets to the desktop and opens up mail for me, but the internet is not connected right away. Still takes an additional 15seconds or so after Mail boots up to get a connection. Then everything works fine. If the computer sleeps, it doesn't have internet upon waking, but again will establish a connection (self assign an IP address) after about 15-20 seconds.
So while not crippling, these 15-20 second waits are very annoying.
Interestingly, this is ONLY with a wired Ethernet connection. If I use WiFi everything connects right away. But my WiFi is slower than the wired connection and I prefer to use the wired connection.
Any further suggestions are welcome.
Chris

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Reg...

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Network connection lost after waking from sleep

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