[ABILITIES] Sometimes does not cast even with consistent ping

It was most noticeable when i was playing Riven, when my abilities AND mouse clicking would suddenly stop working, and my ping would be just fine, and it's not a problem with my software i don't think because on live, it works just fine. It's really hard to test the new rune with my keys not working half the time. Testing steps: 1. pick riven or yasuo or someone with a spammable ability 2. turn on no cooldowns 3. keep pressing buttons until they don't respond.
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