Yup. This is still an issue. I'm running Mavericks on a 2011 Mac Mini low end. It's annoying but only happens with the a browser window open.
This is a hardware problem.
I had this freezing issue before. Apple store replaced my logic board. It's been 10 months and no freezes any more.
If you still have warranty, ask them to fix your Mac.
That makes me sad. I assumed it was a internal GPU issue but was hoping it wasn't. It's out of warranty and if the logic board needs to be replaced I hope it doesnt cost too much.
I rather pick up an updated Mini if they're ever released.
Unsu, if you could look up your support case in https://supportprofile.apple.com/ and post the case number where you got it replaced, it could help me to get my case resolved.
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