Lag Whenever I channel an ability

Normally, my ping remains at 41 or so, and generally it ranges from 36 to 45, which is fine. But, whenever I play a champion with a channeled ability, for example Sion Q or Varus Q, my ping escalates to anywhere between 200 to 400 ping for about 2 seconds after the ability expires/cast. I have isolated it to only a few champions, pretty much anyone with an ability with a variable timing, and some champions regardless of ability style. I don't know the cause, but it definitely only happens on the cast of a few abilities.
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