Lenovo G580 20157: screen flickering

[tanexx]

Hi everyone, please help i have lenovo G580 20157, after i update the bios from 62cn40ww to 62cn44ww the unit became unstable then i update to 62cn97ww but still the same the screen flickering and every 3seconds idle or auto sleep then few seconds auto wake up, sleep and wake up vice versa again and again containue.
anyone can help to solve this problem please help!!