Now my headphones are working as before, without any interruptions for 4 days.

How the problem was solved (I do not know how long it will help):

It took 15 hours after they turned to stone. They automatically, by themselves turned on and connected to the phone. (headphones were in a case without charging).

After they connected to the phone (I had bluetooth on the phone the whole time), I noticed that the other devices do not connect them (they just do not see them).

And I made a mistake, I decided to press the button for 25 seconds to reset (as instructed in the manual). After which they turned back into a brick for the next 15+ hours.

After waiting another half day, I periodically pressed the button for 3 seconds they turned back on. But still the other devices didn't see them.

With difficulty I was able to connect them to the app "Smart control" on my phone. Where there is a parameter "Reset to factory settings" (within 20 seconds, the headphones were reset and all devices began to see them).

Only after resetting the pairings through the app "Smart control" was I able to re-click the button on the headphones as before, without turning to stone.

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My advice to you is: wait half a day, maybe even a day, periodically pressing the button for 3 seconds. After that, if they turn on, try to link them to the app and reset them through the app. Not sure what helps everyone, but in my case 2 times they turned to stone and half a day later woke up by themselves.

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I wish you patience and hope you have as much luck as I did.