This sounds like it may be a driver update issue. You can follow the link below to Lenovo.com support-drivers and look for driver updates for your specific system. Be sure to create a restore point on your system before you make any changes or download new software. Once you have corrected the issue, create another restore point after the fix:
http://support.lenovo.com/us/en/products/Laptops-and-netbooks/ThinkPad-Yoga-Series-laptops/ThinkPad-Yoga-14-20FY/20FY/0002US?linkTrack=GPS%253ABody_Search%2BProducts&tabName=downloads&beta=false
8 years, 9 months ago
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Lenovo Product Expert