The system locks up causing me to lose my pets while going from place to another. I

I am on infinty setting, yet I seem to keep running into a hot pink screen telling me I am out space.  In two different cases, I lost pets while traveling.  This on 12/24/19, I lost 9 dogs and 6 cats.  All had names and personalities, for instance Lady is prissy, while Squirt is always pushing the bounds.     I am not feeling good about this happening, and am requesting this be fixed, and my pets be restored.