Delayed spellcasts

For some reason casting abilities can have input delays of up to 1.5 seconds (which is very long the worst i've ever seen), however my auto attacks and control over my champion is always perfect, last hitting with auto's is no problem but aiming a q with vel'koz (or even casting q)is nearly impossible. it appears to be a league only problem and my lag is fine everywhere else with a consistent 44ish ping average.
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