Here is the problem as best as I can outline it.
As best as I can tell, this is an issue with the a bugged client. Some but not all clients will in some but not all game develop this issue: ~5 seconds of high lag followed by a dc with the attempting to reconnect message. If you quit the game and reconnect, the problem will be temporarily solved, but will reoccur in 5-30 seconds after reconnecting. (I have never had an instance of this where it stopped happening midway through a game).
I suspect that this is an acquired issue, not inherent in the patch. (A friends client was working fine for some time after mine developed the issue, but now has it.) I suspect file corruption, though I have not tried re-installing lol.
The issue is independent of os. (I have seen it on windows and mac.) And can strike at different times to different people in the same game.
This is all the information I have been able to gather on this subject, please reply with any more specifics you may have that I have not found yet.