There are instances where the sprint gets deactivated without the players intent or knowing. If you play a lot of pvp you might have noticed those intense situations. In those cases the sprint must be reliable to always be activated when pressing the sprint button.
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I do play a lot of pvp but I haven't had a problem with it yet. From my understanding if you're not already sprinting, it always activates sprint. So I don't see what the potential problem is unless you're accidentally clicking the stick while sprinting.
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Imagine sprinting and changing your thumb position to quickly round a corner. As soon as you go back to hour original position with someone chasing you , your character bogs down because you have deactivated sprint when you needed it most .
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Maybe you have better control of your sprinting. I keep deactivating it and it feels awful in pvp. If they keeps it like this me and many others would suffer in pvp a lot so I guess wherever you use the stop-running button will suffer when they fix it.