I always liked Robin Shrestha vocal far better than Amrit gurung. I don't know what makes Robin Shrestha leave the group? Heard he is in London or somewhere.
The other thing about Nepali concert is too much noise pollution. Crowd takes over the concert. Music n singer should take the control of the crowd to make it sound better.
However, having said that Nepathya is the only musical group I would ever go to watch them live.