Need some more information:
What Windows version do you have installed?
What CPU/APU do your have installed (Intel or AMD)?
What AMD Driver do you have installed?
Here is Lenovo Support Driver Download for the Z51-70 Laptop: laptops and netbooks :: lenovo z series laptops :: z51 70 Lenovo PC Support - us . See if you have any outdated drivers that you can update on your laptop.
Thanks for replying. My windows version is 1803 (OS build 17134.228)
I have an intel i7 -5500U processor with a AMD Radeon r9 m375 4GB inbuilt graphics card.
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Since you have an Intel APU the only AMD driver you need to download and install is the R9 m375 which you can do from here: AMD Radeon™ R9 M375 Drivers & Support | AMD .