Sprint Disables Mouse Controls

Hey there, sorry to hear you're experiencing this issue. Does it only occur in Battlefield, or have you noticed it in other games or applications as well? I'm also not sure what troubleshooting steps you've already tried.

Have you recently changed any mouse settings in Windows, such as pointer speed, acceleration, default buttons, or other related settings?

Here are some other steps you could try: 

1. Reset all keyboard and mouse bindings to default.
2. Change Sprint to a different key temporarily and test if the issue still occurs.
3. Disconnect or disable any controllers, virtual controllers, HOTAS devices, or controller emulation software before launching the game.
4. If you use software such as Razer Synapse, Logitech G Hub, Corsair iCUE, reWASD, DS4Windows, Steam Input, or similar tools, try completely disabling them and test again.
5. Delete the game's settings/profile files so the game recreates fresh input settings.
6. Run the game with all overlays disabled (EA App, Steam, Discord, GeForce Experience, Xbox Game Bar, etc.).