I dont know why, but something to come up soon.. probably some bad news lined up next week.
What it could be, I have no idea.
But this is the wave count I have shared with Banknifty chart on weekly time frame.
No more ATH now, and it should be heading south soon, and it will be deep.
Don't want to scare, but at-least what you can do, don't carry any overnight positions with index for next couple of weeks.
I will update if my wave counting went wrong.
Fingers crossed.
All the best.