I have purchased mu xiomi reshmi note 4 ( 4 gb ) variant in March 2017.and after that it is running smooth but with little bit of lags and hanging problems.but I am okey with that.but from past 1 month it is being hanging after every 5 minutes and it’s battery is also draining very fast.then I have decided to take to to the service center is is also very hard to find out.the service center personal have told me that it’s is an mother board problem and it can only been fixed after changing it’s motherboard.but they didn’t have the motherboard right now.they have taken my phone an kept it for 15 day. After 15 days also they haven’t repaired my phone .I got very frustrated an I don’t know what to do.right now I have take it back from the service center and I am writing this review with the same phone.dont know when it will get hanged.