Real Sense 3D camera

I have the Real Sense camera in my Dell Latitude 5559 laptop.  It works great and I use it to log me into Windows.  Only problem that I'm having is while it used to work flawlessly all the time, now every time I close the lid and put my computer to sleep, when I open it back up, it's unable to load the camera and I'm not able to log in through facial recognition unless I reboot Windows again.  This wouldn't be so bad except it's so much faster to just let the computer sleep and then start using it right away after opening it back up.  It's not a huge deal as everything still works, I'm just curious if there is something that maybe someone can think of that could be causing this all the sudden?  I haven't really installed or done anything to the computer that would cause this all the sudden either so I'm kind of at a loss.