Damage to new Fescue Grass. Help!

I am a brand new home owner and I planted grass seed about 25 days ago. It has been coming in strong and most of the yard looks quite nice!

I am worried one out of three things is causing damage to the grass:

1. Plythium Blight?

2. Too hot… it’s been uncharacteristically hot here (95 degrees)

3. Over watering not allowing roots to settle deep enough.

Attached are pictures: I would love to know how to fix this if possible and any tips are appreciated!