Hi uzairm87, I suggest you to please adjust the gesture sensitivity and check if the issue got resolved. If you have a case on your phone, consider using a higher sensitivity, as the edges of the screen might be difficult to touch. If you are still experiencing the issue, then I suggest you please perform the wipe cache partition which removes any temporary files and logs from the various application which might be causing the issue.
Hi, Please try opening the "Settings" >> "Navigation bar" >> Tap "Navigation bar" again >> "Full screen gestures" >> tap "More options" under Full screen gestures >> select "Swipe from the sides and bottom" and selecting this will bring the back gesture sensitivity.