Bertilak

Ok, the firewall seems to be the problem, not the antivirus. I'm not sure which version of bitdefender you are using (I'm using 2015 total security). On my version you just select protection, then select firewall, and then just click the blue check mark next to firewall and it should disable it.

I just disabled bitdefender and it solved the issue. I turned both the antivirus and the firewall off. Now I'll try turning one of them back on to see which one was the culprit and I'll report back later.

Bitdefender

I am running antivirus software. I've had this issue since it was first installed

The time interval between freezes is about 30 seconds and each freeze lasts just a couple seconds. OS: Windows 7 64 bit CPU: AMD Phenom 9850 GPU: AMD R7 260X

I seem to be having the same problem. I have sent a bug report. It freezes both in the game and in the lobby. I have noticed that while in a match the number labeled RUr at the top of the screen will spike immediately following the freeze before resuming as normal.