I have the same issue as well. I mainly play on Windrunner US. That said, I do play from India.
I’ve usually had no issues with the normal latency hovering ~250ms. However, in the last week or so, it has been spiking up often to over 1K. I looked at the older posts and found a link to the MTR tool. I’ve run it and from my understanding, it seems to be a very large amount of packet loss on the Blizzard end of things. Please let me know if I’ve misunderstood the results.