2014 mac mini loosing internet connection

Hi, my relatively new mac mini with most current system suddenly started to loose it's internet connection. WiFi or wired makes no difference. It works for a bit then I get time outs, spinning balls and nothing works anymore. All other devices on the same wifi (iphone, ipad, macbook pro, chrom book, windows laptop, apple TV) work just fine, so it's not comcast or a modem issue.
I'm mostly connected with wifi, I moved wifi up in the priority list. I also deleted that particular wifi account and entered everything again, it's a comcast router with wifi built in. Nothing helps. If I run the network diagnostics all things come back with a green light, but even if I try to ping some site via terminal nothing happens. All other devices run great, but I need this compuer on the net. I might take it to the genius bar, but I can't bring my wifi with me, not sure how much that would help.
Any other ideas?
It started sporadically, just a hickup in a video file or a minute to refresh a page, I had comcast test everything too. Now - regardless of what browser I use) I mostly get nothing, if I'm lucky I get a connection for a couple minutes before it's over again. Wifi is connected, I did not change anything or install anything (though some things might have done so automatically) and I know nothing about networking, so I never touched any of those settings, since everything worked anyway.
Any help is greatly appreciated, I can't work without internet on that machine :-(
Thanks!

Hi, this has worked for a few...
Though all of these steps may or may not be needed, I'm including them all.
Make a New Location, Using network locations in Mac OS X ...
http://support.apple.com/kb/HT2712
10.5, 10.6, 10.7 & 10.8…
System Preferences>Network, top of window>Locations>Edit Locations, little plus icon, give it a name.
10.5.x/10.6.x/10.7.x/10.8.x instructions...
System Preferences>Network, click on the little gear at the bottom next to the + & - icons, (unlock lock first if locked), choose Set Service Order.
The interface that connects to the Internet should be dragged to the top of the list.
If using Wifi/Airport...
Instead of joining your Network from the list, click the WiFi icon at the top, and click join other network. Fill in everything as needed.
For 10.5/10.6/10.7/10.8, System Preferences>Network, unlock the lock if need be, highlight the Interface you use to connect to Internet, click on the advanced button, click on the DNS tab, click on the little plus icon, then add these numbers...
208.67.222.222
208.67.220.220
(There may be better or faster DNS numbers in your area, but these should be a good test).
Click OK.

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