MacBook Air freezes halfway thru Yosemite install

So, I have a Mid 2011 Air with 4 gigs of RAM and a 256 SSD.  It was gray screening on me a lot and I suspected a hard drive issue so I did an OPTION+COMMAND+R, deleted all partitions and reinstalled the original OS.
The machine runs great after the new OS install and I worked it pretty hard to see if I could gray screen it again and I could not.
Now, I went ahead and began my upgrade to Yosemite and half way thru, it freezes and just sits there with the progress bar not moving.  I've let it sit for hours.
It would appear from the apple site that the air is compatible so I'm not sure what the issue could be.
Thoughts?
Thanks
Cliff

My own thinking here, I was doing it off of wireless.  I wonder if, somewhere in the middle of the install, when wireless adapter drivers are going in, if that is breaking the connection....
I'm trying it wired now.

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