Just replied to a post in the 9PP forum specific to this issue, but probably more appropriate to mention here…
After the last firmware update I started getting frequent phantom alerts/vibrations - several per day with no message on the screen or apparent reason.
In my case, this behaviour it disappeared after a few days without me taking any action, however over the last few days it has spontaneously started again - frequent phantom alerts/vibrations.
Not sure if this was acknowledged as a bug in the latest s/w and we can expect a fix in the imminent release?