I layed sod two days ago, put down top soil before, and have been watering 4 times a day for about 20 minutes, it gets plenty of water due to good sprinkler coverage. One patch of sod is completely brown and crunch within the two days! I'm panicing b/c i paid so much. Its about 100 degrees already in Las Vegas, should I just relax and let the sod do its thing? Will the grass grow together and repair the bad patch?