I might have found the solution for this problem:
I installed latest AMD Radeon Drivers, and I turned off all settings on Radeon Software a part from AMD FreeSync. I have not been having stuttering for last 3 days when I turned them off. I do not know which settings was causing the problem. Please see below screenshots for my exact settings:
Please try and provide your feedbacks.
I hope this would work for all of us.