random latency

since the latest patch i have about a 50% chance of getting mad latency. i either have a match which is fine, around 20-60ms, very playable all game with no spikes, yet the next game i will have a game at around 300ms which is about 1 -2 second delay on all actions. This is not playable, or at least very uncomfortable. seeing as i have made no changes to my system or network between these 2 games i cant understand whats causing it at all. for the record, so fa all "practice tool" games have had high latency at around 300 ms, so i dont know if its like some servers that riot use dont agree with my setting and some do or what. anyone else have this trouble?
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