I have a something very good news!

I was download the new OS windows 8.1K about two weeks ago, and I test my JJ2+ with internet play.

Result? PERFECTLY WORK!
I've never seen any bugs while I'm playing!

In short,
Windows 8.0 → sometimes makes troubles.
Windows 8.1K → no troubles.
My guess → 8.0 is s---

But one thing.. I don't test yet.. '8.1'(at first, 8.1 and 8.1K are slightly different. I don't know why is it not downloaded on my computer but anyway, and surely, 8.1K isn't makes no problems. )

So, just my suggestion, If you have a same problem like me when your OS is windows 8.0, then download new OS to windows 8.1K and try again. maybe it'll be very helpful to you.