I have been using this phone for 8 months, in starting it is very cool and also gave good performance. But later xiomi launched its new phones in market note 4 is becoming slower and slower than usual. Its also have performance issue while playing heavy games and now , it also crashes the application due to its small ram and a heavy version of mi. There is problem of lagging and also battery issues plus heating problem also, which is a major cause of fast battery draining.