I dont let it drop lower than 60% before charging.

Batteries now go on cycles. The more charging cycles, the faster it will fail.

I do this for my Macbook also, i can see the battery cycle wont go up fast if i keep this charging habit.

Yes faced this issue few days back. On Maxis also.

Seems to be ok now, but on and off will have this issue.

I find that it;s not charging pattern.

It's how you use the phone. Too much gaming, too much videos...lots of heat.

Some use those idiotic privacy screen , but then to see, the brightness has to go all the way up, that will really kill the battery.

How Facebook and Messenger Apps Drain Phone's Battery
Why it happens and what you can do about it

https://www.lifewire.com/how-facebook-messe...battery-3880043