One reason your grass may be browning up is whoever is cutting your grass, might be cutting it too short. The shorter grass, under 3.5" will not be as green as 4.5" or taller, everything else being the same like water frequency, amount of water, and chemicals applied. Most lawn services cut lower than the recommended height of the people that create the different breeds of grass, as well as The University of Florida.
When you first raise your grass to the recommended height, it may look uneven after cutting. Be patient, as the shorter grass areas will fill in and in a few weeks the grass will get to the new height, be level and considerably greener. If you walk around your neighborhood. Look at the greener yards and you should see most of them are taller. Just my opinion based on recommendations and years of experience. Good luck.
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