@Timothy-and-Kristin0
It seems random to be honest. Some hosts are, like you, completely baffled, but CS refuse to tell them what the issue is. Often, the host is told they have to 'fix' the problem, but how does one do that when one doesn't know what the problem is in the first place?
Other hosts have an inkling because they've had a problematic guest recently who likely complained, e.g. one that was refused a refund or asked to pay damages and then retaliated by raising a false complaint.
In other cases, CS told the host what the problem was.
There seems to be no rhyme nor reason to it.
I've only once had a guest contact Airbnb to complain (to my knowledge at least). In my case, luckily CS did not take this complaint seriously. I am guessing it's because the guest was a bit unhinged and irrational but I still find it strange that they never contacted me, let alone opened any case about it. I only found out because a week later, I called CS to ask them to tell this guest to leave. They casually mentioned that she had complained about me a week before, but said they couldn't tell me what it was about for 'confidentiality' reasons. I was fortunate in this case because CS totally sided with me and, after reading the correspondence with the guest, told her to leave.
However it seems to be the luck of the draw...
