Random DCs [Client][Crash]

Okay so before I started playing a match today, I had tried to start another one. I was taking my time to decide on what champion to use on draft pick. However, with 12 seconds still on the counter, the game kicked me out for not picking a champ and decided to give me a 15 minute penalty. So I waited 15 minutes and started another match. Everything went smoothly during the champ selection this time. However, Once the match started, it kicked me out again and wouldn't let me reconnect to my match. I kept retrying but it would just send me back to the reconnect screen. So I decided to relog in and try to reconnect again with no such luck. This time, instead, it told me to turn of my firewalls or whatever message it gives you. At this point I thought that it might not have been a problem on Riot's end but mine. So I restarted my computer and tried again. I succeeded in connecting to my match already four minutes behind and everything was going smoothly. I had no lag and even managed to pick up a kill before having any problems. Throughout the match though, I kept disconnecting without a warning. My ping was fine and I wasn't lagging at all. Then, in the middle of a fight, or farming, or defending, or whatever I was doing, I would disconnect randomly. It happened multiple times and I seem to be the only one with this problem. I know it is not my connection because I suffered no lag and this is the first time it happened to me. Can someone please tell me what is going on?