There tends to be moe issues if you use the App than if you use the website.
The Support staff cannot always resolve these issues and have to rely on passing them on to the IT systems department and await that dept response, which often takes time, as there is always quite a queue.
Payout Methods involve connecting up different systems and I understand that at times the problem isnt always with the Airbnb system but with the bank system that they are attempting to connect up with.
Yes, it is frustrating indeed and on top of it there are also server problems intermixed at times.
Maybe contact your bank and ask if they themselves are experiencing problems with the Airbnb system and see "where" in the system the actual problem lies.