ok so i have been having a problem with my sprint button on my Xbox 360 controller and I have found out what is the problem (i know alot of people that have the same problem I had) What you do to fix it:
1. Take controller apart.
2. make sure the button on the motherboard clicks when you click the LS button.
3. if it does then thats not your problem.
4. see if the LS button (the black part) easily detaches from the pedastal it is sitting upon. Is, so this is your problem.
5. switch the LS with the RS and then put controller back together and that should be fixed.
(the reason behind switching the LS and RS is because the RS most likely still taks a little force to get the black part off as you dont use the clicking of RS as much as the LS so therefore when you switch it the new LS will have a tight grip to the pedastal and it should work fine for sprinting. as for the RS it should also work fine because theres no one that hits the knife button more than they hit the sprint and the turning of the character works fine because you do not need to click the Button.)
thanks for reading and if you try this let me know how it turns out!