About the lagging video playback, surprisingly it's running fine and
smoothly for now. But just to let you know, last time the video playback
wasn't actually lag all the time but happened sometimes. I realized that it
usually happened after a long day and a high usage on the phone. But when I
play a video before a high usage on the phone, it wasn't lagging. For
example, when I just started the phone or when I didn't run lots of apps. I
have not retry playing a video after a high usage on the phone again
though. It may result in lagging again. I am not a tech kind of guy but I
am thinking that it may has something to do with the RAM? Maybe the video
lag due to the high memory usage of the RAM?
I hope these information may help you in finding the solution for the
problem. Thank you.