A few days ago my phone (Oneplus 8T 128gb) started saying that the storage was running out. I checked and the system folder was 84gb, i then deleted some apps and photos(about 4gb). A little later i get the same warning. Then my system folder was 88gb. I factory reset my phone and recovered it with a few days old backup. Then the next morning i wake up to the same warning and system folder was 104gb. I am on second factory reset and check it every 15 min, to see that my storage is slowly consumed by the system folder.
How do i fix this????