OnePlus India — One plus one : after update to android 6.0.1, problem started

After one recent system update, my phone has started having problems :
1. Frequent battery discharge (Wifi / 3g)
2. Even after putting on charging, battery only discharge instead of charging.
3. Phone gets hang sometimes.

I am very much fed up with these major problems, after this recent update only i am facing issues with my phone, i want one plus one to repair the problem as it is software related issue & can be resolved with some new update (I guess).

My current android version : 6.0.1
Cyanogen os version : 13.1