A:AnswerIf the unit was purchased in July of this year, it is not normal. If it was July of last year, the description sounds typical of usage after 1 year. The fan is loud because it is not getting proper ventilation.
A:AnswerThere may be a power management driver that can help with this issue. You can follow the link below to look for driver updates for your specific system. As always, be sure to create a restore point on your system before you make any changes. Here is the link:
http://support.lenovo.com/us/en/products/Laptops-and-netbooks/Yoga-Series/yoga-900-13isk2/80UE/002SUS?linkTrack=Homepage%253ABody_Search%2BProducts&beta=false