Halo 4 Sprint not working. Please help!!

Can someone please help me with my gameplay issue? My sprint functionality wont work at all. I need someone from 343 or someone with troubleshooting experience to help me out. I’ve been playing Halo 4 ever since its midnight release from gamestop, and I’ve never had this issue. Over the past two or three weeks my sprint just shut down. It refuses to work. Rather than making me faster, it either doesn’t do anything, starts and IMMEDIATELY stops or actually slows my movement some.

Lemme start off saying, ITS NOT A CONNECTION ISSUE. I have looked in to everything related to connection and its not it. THERE IS NO LAG WHATSOEVER. My sprint just doesn’t work. Its also not a NAT problem so don’t even bother bringing that up. Also not a stick issue cuz I play on recon and sprint functions with X. Also not an input issue cuz Ive tested my X button many times In the menus and other games, and it works fine. If anyone has any ideas as to why its not working id love to hear it. (UNLESS ITS ANYTHING TO DO WITH WHAT I JUST SAID. NOT NAT, NOT CONNECTION, NOT LAG, NOT THE BUTTON, NOT INPUT ISSUES.)

I would really appreciate some help.
Thanks.
KSI Calvary

Only times I’ve ever had that be an issue are when the game’s lagging or my controller’s broken but apparently those aren’t the answers you want to hear. :confused:

Well do you know what I could do to solve lag issues?