My Game client "crashes" after almost every game

So I get this thing where after almost (about 90% of my games) my client will crash so I can't get to my post-game screen. It says something along the lines of "An error has occurred". It happens in queue's a lot too, so then I get the "Afk check", and after a 5 minute queue we have to start over. Normally, I just deal with it. But recently my afk check has gone off 2 or 3 times in a row (the queue just never appears to pop, and then the error message comes up and we are back in the lobby). I then had to DC from a game I was playing in; it was ranked, and although it was my first DC, I was hit with the low priority queue.

I will admit, I deserved this - I DC'ed. We still won, but it wasn't fair to my team. And it was only 5 minutes, so I am not complaining.

Unfortunately, since being in a long queue causes this problem to occur frequently, I had to wait through 3 low priority queue times (with an ever so patient friend) to get into one game, because my client crashed after we waited through the Low-priority queue. Yes, I messed up in DCing, and no (although technically it should not have given me the queue), I'm not trying to fight it - I don't want a Low Prio Q, I shouldn't start games when I have to leave.

But is there anything I can do about this problem? I have uninstalled and reinstalled the game, repaired it twice - nothing works. I've even played on my account on my other computer in the house, and it did the same thing (although that was a while ago). Is it my internet? My account? Did the same problem just happen to happen on two computers?

Anyone else have this problem?