you have the same issue so its just not me. I really don't know if it is the flash being so close I took a few shots with flash on and they were perfect it wasn't till a few days later that it started to happen.View attachment 1863097
View attachment 1863098
View attachment 1863099
View attachment 1863100
Similar problem on low-light (used night portrait scene, night scene, normal, all with flash).
Cleaned the lens, flash etc. Seems like the flash is placed a little bit too close to the lens.