Xiaomi India — mi a1 handset is getting switch off within 1 - 2 hr time span regularly

Address:

Gondia, Maharashtra, 441901

Hey, my handset is getting switch off continuously within regular span of 2 hr. It also has the problem of screen blackout. So take the immediate action as possible as i' in certain need of it as my all important work is halted.
As it it n new handset buy nearly 4 month ago and it already showing such kind of problem is not to be consider as customer point of view. So pls take into the consideration of the problem accruing problem