To me this sounds like something has downloaded with an app.
Put your phone in Safe Mode which disables your downloaded apps and leaves the stock ones working and then see what happens.
If it stops then come out of Safe Mode and start deleting your most recent apps one at a time until it stops @Davethemalt
Daily Driver > Samsung Galaxy s²³ Ultra 512Gb in Phantom Black.
The advice I offer is my own and does not represent Samsung’s position.
I'm here to help. " This is the way. "