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As your Ideapad equipped with GeForce GT645M discrete GPU, I would suggest to disable the Intel HD G 4000 or make GT 645 default, and use for few days if the problem doesn't appear you can assume the Problem is with Intel HD 4000 driver other wise you may have to contact Lenovo for further support. Hope this will help.
We have developed a new driver that was released very recently. You can download it at the following link: