My very first encountered problem.. i don't know whats going on, but like every 30 minutes my internet stop responding and get a weird yellow triangle thing next to my wifi connection..
never did this before.. and its starting to get annoying
I was told Microsoft took the w8.1 back due to problems.
And I've not heard about that it has been fixed. And due to that they took it back and has now released it again.
-I do believe there should be some few problems they still have to fix.
But as some have said: It might be that your hardware inst' for Win8.1. (As I've read some AMD CPUs won't run Win8.1)