Keep an eye out for chinch bugs. They are common in the hot edges of lawns, like next to the curb. The symptom is a large brown patch, which makes it easily confused with brown patch or grub worm damage. To determine whether this is chinch bugs, cut off a milk jug or similar container and press into the soil. Fill with soapy water and watch for the small insects to jump around or float to the surface. You can prevent this problem if you keep the grass watered in those hot areas and avoid over-fertilizing or mowing the grass too short.
Avoid lawn problems by raising that mower height to keep the roots cool and to fend off weeds, too.