St Aug disease identification

I sodded my backyard with Palmetto St Aug about 4 years ago and I'm running into my first big issue...not sure if this is brown patch/TARR or something else (cinch bugs?)









it was looking a little thin in this spot last year (but nothing like this year) so I top dressed with a little sand, which you can see in the last pic

as you can see in the first pic, the rest of the yard is mostly fine, but there are a couple of very small spots that are starting to look like this looked last year so I want to ID and get on treating it


I fertilized in mid April with Fertilome 24-0-4 w/Iron for 1 lb N per 1000 sq ft intending to follow up with 2-3 more apps of same later in the year and I also applied Specticle Flo pre-em last October