@Olga464
You asked, "Why there is such a dramatic distabilization of the system going on for a moment?
This is nothing new, or unusual. It happens all the time - and has been for years - particularly in grossly over-saturated cities, that have huge numbers of new host sign-ups (often on foot of a recent recruitment drive), coupled with a proliferation of listings from "professional" and commercial operators.
For whatever reasons - although Airbnb will always swear blind that it's down to "technical issues" or "glitches" - many hosts will find themselves periodically ghosted. The longer they're hosting, the more reviews they have, the more times they achieve superhost status, the more Airbnb over-saturates their towns/cities - the more frequent (and longer), the "dry spells" become.
Hosts will then tie themselves in knots and drive themselves insane, trying desperately to find reasons for the sudden halt in bookings/inquiries, and very often come to the conclusion that it somehow must be their fault, or something they're doing wrong, or maybe there just aren't as many visitors to their area etc etc - but in reality, it's very rarely any of those things.
You'll never, ever find a CX agent - anywhere - who will admit that ghosting happens, of course. You just might come across an occasional one who'll let slip that "rotation" occurs (usually a newbie, who hasn't yet learned the code of silence), but that's as much as they'll ever admit to. I've been studying the Airbnb markets for a long time though, and am in contact with dozens of hosts in many cities worldwide, and the patterns are finally becoming clearer and clearer.
The only thing you can do, is keep hounding CX in the hopes of a quick resolution. And set up your adverts on other sites, because once this starts happening on your account, it will happen again and again.