So as pointed out by Mirai it's generally overworked hardware that causes this. You can sort of force this issue (as a test) by putting 5-10 clients on one CPU core and spamming dps buttons. Most clients will work fine, some will start lagging, then delayed key-presses leading to an eventual crash if it can't catch up.
Weird eh? Before 8.1 it would just lower your fps and that would be it.
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