i think could be gc problems back in prebc i used to face the same thing in bwl coz my gc wasnt that good and i put all settings to the max then when aoe times i always lagg like hell summore i used to play in aust.....so my connection was green bar...then when i reduce some fetures every thing went back to normal but then again now day's got spikes even with good connection..

oh that is good enough hmm could be latency issues then you ever try reducing the detail's?