I turned my system on today tilted my yoga to move it and the screen automatically rotated. So, here's a list of all the steps that I took in case anyone else is having this problem (I honestly have no idea what caused it to work again): When I noticed the
issue the first thing that I did was restart the computer... I manually put the system into portrait mode; Tried using the system in tent mode; Turned on tablet mode.
When those didn't work I went and updated the drivers under Display Adaptors; restarted the system (in between each update) Uninstalled the drivers under Display Adaptors (restarted the system for each driver). Updated and uninstalled the drivers in Sensors
(again restarted between each)
Went into Services Turned Sensor Monitoring to auto, made sure that Sensor Services was on Auto, Disabled YMC (which caused the Rotation Lock button to not be grayed out before),
Went into the Registry Editor under AutoRotation made sure that everything sans LastOrientation was set to 1; added AutoRotation Key set it to 1.
I ran the Lenovo Diagnostic Tool; Went in command prompt did a DISM scan, chkds scan, and sfc scan... gave up for the night as nothing was wrong in the scans and turned off my system.