@Gillian166
I have always found Airbnb notifications to be erratic and I know it's not my phone. I have had three different phones (completely different brands/systems) since I started hosting and there were always problems. Quite a few guests have also told me that they found it glitchy.
However, I haven't noticed anything unusual lately. How old is your phone, by the way? I have an old iPad and, until recently, Airbnb worked fine on it, but now won't upload. I guess because the iPad no longer updates to the latest versions of iOS, so one by one, the apps stop working...