I just knew you would want to see it. This neighbor's lawn was sodded about 3 weeks ago, newly constructed house, sandy soil. And I know what sod farm it came from. Mostly looked great.
A few of the pallets had rust fungus.
About early October this dollarspot appeared. There were about 3 or 4 spots. I told the guy--don't panic--both should clear up as it cools off.
Whoops. I didn't want to include number 3 and 4, but so far cannot remove them.