[Q] Screen flickering/ distorted texts MT7-L09 topic

Hi! I just bought a mate 7, black 2gb/16gb version and I noticed some screen flickering issues whenever I play some games like badland. Texts appear distorted too sometimes.

Please, how do I fix this issue? :(

Video Audio Concerts Distorted topic

When recording in loud situations for example me and my friend we got the very same phone S Galaxy Note 3, went to this EDM concert and we both took a couple of videos, hes got original stock rom and i have rooted custom rom, his recording was really good on the bass audio but mine was unbearable on the sound it was really distorted all the way through when the bass comes, and i have tried a couple of roms now but with the same outcome, so i was just wondering what could be causing this, and how to fix this...? Thanks in advance..!

Phone: Galaxy Note 3 N9005
Rom: Pac Man Rom (Android Kitkat 4.4.4)