This used to be the best lawn on the street, but slowly each year it has been getting worse. I just had it thatched, but there is so much dead grass that did not come up. As you can notice in the pictures it is streaky in the way that the grass has died. Also this lawn it on a hill and the sun beats on it all day. It is a 5 year old lawn, but this is the worst it has ever been. Is there anything I can do to fix this? I can't believe it is just a lack of water or the sun because it is very streaky...there is green grass intermingled. Thanks for any help.