I'm in the Boston area and my lawn is in full sun from dawn til dusk. It's black beauty sod that was done in Oct 2017. It's green from a short distance away but once you walk on it you can see the problem. If I take a de-thatching rake I can pull up huge piles of this dead stuff, but I don't think it's a thatch issue because it's still rooted. Yesterday I pulled out a plug in a problem area and the soil is pretty saturated at least a few inches deep. Can this mess be due to me over watering? I'm scared to stop and have it dry out. I very rarely see mushrooms and it's never sloshy. I fertilize 4 times a year. It's pretty consistent throughout the entire yard but some spots are a little worse. There's one area along the fence and another along the side of the house that are nearly perfect, but those areas get shade and the rest doesn't. I don't know if it's too much water or just heat related. Any advise will be greatly appreciated.