Difficulty using ult as Slayer

Issue Summary: Sometimes, usually in intense situations with a lot of enemies, I’ll need to press F several times to get my ult to trigger. My keyboard is a Corsair STRAFE RGB with Cherry brown buttons. I know Slayer needs to be on the ground to use his ult, and I’m not in the air when it happens. I don’t know if the game thinks I’m in the air, if there is a network issue, or if my F key just wants me to lose.

Steps to Reproduce:
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Reproduction Rate (Choose One):
Once
Rare (< 10%)
Unusual (< 25%)
Common (< 50%)
Often (< 75%)
Constant (100%)

Additional Information:

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Also had several issues with Slayer ult not going off.

As well as Zealot and Unchained but not as frequently as Slayer.