Random black dots appear only on recordings

Help...I am recording a series of videos, and most of them have these random tiny square blocks (around 6-7) scattered all over the screen. It isn't on every video I have recorded today, but most of them. It has been on-going for several weeks, but no amount of research has turned up with any luck. I have uninstalled and reinstalled the app. I have adjusted some video settings, but no luck. Anyone else have this problem?