Disconnections

So, this has happened about three or four times now, but it occurs whenever I get into a game. During the loading screen everything freezes, and the little blue ring that indicates that everything is still running smoothly, stops spinning. I then have to force shutdown my laptop, and when I come back to open the client, it states that my client has been reset to an older patch, so I'm unable to try and reconnect to my previous game which results in AFK reports and the all so constant LeaverBuster, which I'm sure I have now as this problem happened just now.