The sudden appearance of spots or flashes can indicate a tear in the retina. A sudden increase in the number and size of floaters may also be a warning that the retina is tearing. This is sometimes referred to as a "shower of floaters." § §
I don’t want to write much about this (personal reasons), but I’d like to point out readers to the concept of Retinal Detachment. Its something we must all be aware of. I wasn’t aware of it until about 2 years back, and as far as I know most of my friends/ foes aren’t either.