iPhone XR wallpaper changes on its own = malware?

My wallpaper has been changing on its own to a low res image of Minnie Mouse. I don’t have this image in my photos to my knowledge so can’t figure out where it’s coming from.

I had a spate of changes a month or so ago and the issue has returned. Running Ios 16.2 but MAY also have happened under previous version not sure.

I can change it back by selecting a different wallpaper then switching back to my original so it’s just a minor inconvenience. My fear is it is some form of “malware”, any ideas how to stop it reoccurring or if this issue has other consequences?