I noticed the issue when playing online.
Sprinting consumes stamina. When you use up all of your stamina the screen color shifts you can’t move at full speed until your stamina refills. Once your stamina refills you should be able to move at full speed again.
When your stamina bar fills, it just starts immediately draining again. Your screen’s color does not return to normal, and you don’t begin sprinting even though your bar is draining as if you are sprinting.
You can deal with it by stopping for a few seconds or tapping the sprint toggle. It is an intermittent issue and does not occur every time.