Why PTR is active?

Today PTR was updated in my Battle.net (Aug, 9th) and it is live.
Why PTR is working today?

It is to test fixes for the freezes that many are experiencing on the live server.

PTR Pop-Up | Focus on Freezing Issue - PTR NOW LIVE! - Bug Report - Diablo 3 Forums (blizzard.com)

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Those freezes are annoying as.

On the PTR, each iteration has gotten better.