"An issue with your computer is blocking the vac system."

I was in the middle of a game and this disconnected me from it. It's the second time this has happened to me while in a match. I couldn't connect anymore so I now have a 24 hr cooldown now. Could anybody explain why this happens? Could it be because of the hacks I use (T_T Phoenix)? I just wanted more insight on this issue. Thanks!

if by now you still havent fixed it,
heres how i fixed it, i was in a match got the same and all i did was restart my pc launch steam and i was fine