Keep losing internet connection since installing Yosemite

After installing Yosemite on three Macs I am unable to maintain consistent internet connection on two of them. One with ethernet connection requires repeated rebooting of the router, and the other mac (wi-fi) requires going through systems preferences\network\diagnostics repeatedly. The third mac is operating just fine.
Any ideas would be helpful.

I have exact same issue. Worked perfectly before Yosemite. After Yosemite, connection to Internet and Server drop out continually, every 15 minutes or so. Other MAC works perfectly on the same connection. Have already verified that the cables, router ports, etc are working fine.
Your advice will be greatly appreciated, as the frequency of drop-out makes it unusable.

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