My neighbour had recently bought Redmi Note 4. He has faced so many issues. I am just listing few here.
Build quality is too poor. Within 1 month of usage, side portion of the screen got broken.
Internet connection is getting disconnected often even when the data signals are ON.
It takes 2.5 hours to charge 100%.
Extreme heat is produced at the time of charging.
Battery issue exists.
Sometimes Touch pad doesn’t work properly.
Music player gets struck often.
He was totally fed up with the issues. At last, he has decided to buy a new phone.
So I recommend everyone to buy only the established brands having the decent service center. Don’t judge the phone just by seeing the price.