Black screen problem

Well this keeps happening to me. Im fine to log in for maybe a day or two. Then when I try to go into a game I'll get a black screen after champion select instead of a loading screen. Then a popup comes up saying my antivirus might be blocking league. I've tried all of the suggested fixes, but it happens anyways. I try relogging into my game that I am about to get a leave for and keep getting the same black screen of death until the match is over. I know for a fact that the problem isn't with my computer because it happens in between games at times, like the latest leave I received (while typing this message, and yes i am still trying to reconnect) which was played directly after another match. Am I constantly being sent to a bad server? How would I avoid that in the future? Any miracle fixes to help me avoid this leave?

Additional details: Summoner: allthemuslims CPU: Intel sandy bridge i5 duo Ram: 4 GB Frequency: 5/6 days per week (yes days where i cant play D:) Server: NA

Anyone else have this problem? I feel like I can only play customs now for fear of leaverbuster killing my account that I literally just spent money on before this problem started up.

Edit: managed to make it in on a miracle