Ad's are not in your stock apps so this leads me to believe that they are in one or more of your downloaded apps @llc28352
Put the phone into Safe Mode which disables your downloaded apps and leaves the stock ones working and see if the ad's stop.
If they do then it's a process of coming out of Safe Mode and start deleting your most recent apps one at a time until it stops.
You can send your phone logs / files as an error report to Samsung via the Members App / Samsung + App.
Also as a troubleshooting tip the following may help.
Process 1
Turn your phone Off and then from a set series of button presses go into the phones system files and clear the cache files.
Process 2
Back up and remove any relevant Sd card and factory reset.
Process 3
Use a Samsung Experience Store or Samsung Service Centre.
I wish you all the best with this situation.
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. "
