Trying to push Shift + A in Game Stops Movement

Hi and thanks for reaching Microsoft Xbox gamer's community. My name is Josef.
I'm an Independent Advisor and a Microsoft Xbox user like you.

Hope you're doing great today despite this L0STPERFECTION

Try this:
Open Task manager > select the startup tab > disable all the programs listed there
Restart your PC and give it a new try

If that doesn't work:
Create a new local administrator user in your PC and try from there
https://support.microsoft.com/en-us/windows/cre...

If the issue persists do this:
Perform an in-place upgrade for your system (don't worry your content will remain)
https://answers.microsoft.com/en-us/windows/for...
If you're on windows 10 steps are the same, you just need to download windows 10 ISO

Map the clutch to the A button then you can shift up with B+A and shift down with X+A (basically just pushing two buttons at once) By far the easiest way to use the clutch with a controller.

When he shifts to the left, push right. When he shifts to the right, push left. I always watch his legs, it is easier for me to see the changes. No need to go slow or part way, I always go straight from one extreme to the other, and never have any trouble.

Hi. My name is Brilliant and I am happy to assist you today.

Here are the steps you can follow to try change the movement mode:
1. Go To The Menu "Settings"
2. Go to the "Movement Mode"
3. Enable the "Mouse+Keyboard" Mode.

For more details on the above kindly visit: https://alvarotrigo.com/blog/shift-lock-roblox/

I hope this helps resolve your issue.

I had a somewhat similar issue, but mine was the sneak button. No matter how many times I would push on the left stick, it would not go into sneak. I don't think my stamina was effected, but turns out mine was a glitch from a warewolf shift. I rested and
then shape shifted again and it fixed it. If you have Vampire or Beast form, try to shift form and see if it fixes itself after that.