Okay I've ran through all the possible reasons I keep dcing. Then I ran through other games with multiplayer connectivity.

The three games I've tried so far:

Natural Selection 2
Dota 2
Counter-strike Source

I get about 2-3 mins into a game on each one, then get dc'd. The same problem I have with LoL dc's.

So this leads me to confirm that it is NOT LoL at least in my case causing this...
I ran in safe mode and ran three separate AV scanners and cleaned everything, then did a register clean. That didn't fix it.

I reset my router and modem. Didn't fix it.

I made sure all the plugs were in tightly.

I'm not sure why it just completely stops sending to the source. For example, I will be in LoL, I will hit reconnect, and it will NOT reconnect. I actually have to hit cancel, and then hit rejoin. This works EVERY time. There is no delay between the attempt of rejoining. So there is no bottleneck. I have a 30mb download speed... so I doubt that would be an issue. Even with spyware/malware, they are not going to use 30mb ds... I even tested watching a netflix video on my 2nd monitor, while LoL dc'd. The netflix video did not get disrupted.

So I'm going to ask a few questions and maybe we can identify at least the source of the problem.

How many people having DC issues in game (3 min dc's) have comcast as their provider?

Do you have a firewall enabled? I've noticed that my McAfee firewall says it's on, but it's not and when I Try to activate it, it instantly turns to off. Same with the windows firewall.

I'm trying to verify that there is not a windows update, or something of the sort... that changed things with our network. Where maybe it forgets that it was communicating?

its a new disconnect system implemented in the last update, i am sure of that.

do you know when the last windows update was? I was playing LoL fine two days ago. Tried updating my firmware. Didn't fix it. Going to try plugging the modem directly into the computer...

Hey dude, I have comcast and I've been getting the same problem for the past few days. Just now I downloaded a thing from comcast called "Easysolve". I ran it when I had one of my disconnects. I've played 2 games so far with no further issues.

My hope is that it's a permanent fix.

Good luck.

First off my McAfee does the same thing, and it used to not do that a few months ago(I have no clue as to why and I can't fix it either). Secondly I'm pretty sure this has nothing to with Comcast as I got WindStream like a month ago and League was playing fine up untill the Spectator Patch. I haven't had any problems playing any other games either but I haven't tried DOTA yet, and I've done everything that I can possibby do on my end and still can not get League to work.

Having the same issue on charter, didn't happen before spectator patch.

Oh, so get this I finally got mine to work the other day. I just uninstalled my McAfee turns out it's ****ed up for a while now and after the latest patch it just made it worse so I just comepletly uninstalled it and now my League doesn't DC there is just occasional lag that I can deal with.