I've had this happen in custom bot games.

Everything would just freeze after awhile, then I'll get booted.

mine are by ping
customs

Starting about 4 hours ago my game starting lagging hard to when I made a custom. Though its about 8-13 minutes in, and all bots. The ping would randomly fly up to 1000-2000 (though it would lag out for as long as 12 seconds at one point...), then it would disconnect me after a final giant lag in the ping...
Normal NA server works perfectly fine for me though, so its definitely not my internet. I guess the server is having trouble again...

Been having the same problem all night long. Seems to be ping starting about the time minions spawn. Had to quit out of a normal and Co-op/AI game because of it. In the normal game I just quit out of it because the lag was unbearable. The Co-op game I actually tried waiting the lag out and it eventually disconnected me and wouldn't let me reconnect.

I just had this problem last game. It was on the winter map though; don't know if that has to do with anything.

Hey peoples - thanks for the report. Please clarify whether you're seeing FPS or latency (ping) spikes. We also would love to see some r3d and net logs! Attach them to your replies. Thanks!

yes, these lag spikes are occurring to me too! it's so dumb, i just stand there and take a beating!

Tried another Co-op game tonight. Game was fine, leashed some stuff in the jungle just fine, 2-3 minutes in ping went through the roof. Good 10 seconds or more lag on abilities and movement, then it disconnected me from the game. Would post some logs but I don't have them. This is only occurring in LoL, anything else online is fine.

yeah this lag is really getting old. come on riot improve the servers or something... extremely frustrating when I manage to log back in and kids cuss me out and tell everyone to report me. When it's not my fault i play WoW MW3 BF3 and never lag.