Good day...
As of a couple days ago I can no longer sprint consistently...
I do the normal sprint input & my sprint cancels, instantly or with varying delays...
(I have seen videos on the topic, none of which has rectified my worsening situation...)
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If you're playing on console and using a controller the issue may be with your pad. The joystick mapped to your sprint is likely the suspect if you are a controller player, cleaning it or replacing the controller are workarounds.