Q: How much of a clean install is Yosemite?

My mac has been losing it's internet connection a lot.  The Wi-Fi signal is still there, but every once in a while it just can't find the internet.  When this happens I have to log out and restart my machine. It isn't the router since I don't have the same issues with my iPad, iPhone, Windows 8, or Ubuntu computers, just my iMac.  I was going to reinstall Maverick, but then I thought why not just upgrade to Yosemite.  Which I did a couple of hours ago.  Then just now I lost my internet connection.

So my question is this... is there any profit in reinstalling Yosemite?  I'm not quite at the point of wiping my entire hard drive and doing a complete clean reinstall (well almost).