the problem is different here.. The screen flickers were constant and not in any app or any mode for us and only in 144hz mode

yup, because I had did not update my laptop for last 15 days but I changed the setting in the adrenaline software to turn on amd free sync, And the next morning when my laptop was in sleep I saw the flickering lines at the top, I immediately understo...

try disabling the amd free sync in the amd adrenaline software 

Instead of Uninstalling the adrenaline you can either install it with a option called driver only or disable the AMD free sync option in amd adrenaline software