Which oxygen os version are you using currently..?
Off your jio sim for 2-3 days from setting then enable it again.
Don't force your phone to use LTE only by using #*#*4636#*# *.
Oneplus sucks in case of updates
U got everything 2 with Oneplus 2 :P
Can you check current flow..
Dail *#808# it will open manual test scroll down click on charger..
Check while charging only
Yupp.. Your thread, you only just now edited.
Nougat will come., no doubt but there is no ETA.
And also it will be last update or 2nd last update for Oneplus2.
2nd last Bcoz bugs need to be...
OS, current o/p using ampere and when you bought Oneplus2
Share your phone details first
Try factory reset, use wifi for login and also check your Gmail account is working fine or not using browser in PC / laptop
Try cache clean in recovery mode.