[quirky3]

I've had similar experiences with my Florida lawn. The minute I see a yellow ring in my lawn, I arrange to have fungus treatment applied, and it usually works. Sometimes over-watering (or a lot of rain) can contribute to that. Also, lawn services use the same equipment on many lawns, so it is easy to spread fungus or bugs that way. But the good news is that it is all treatable. Try to notice and catch it early.