I agree with Quirky. I think your Bermuda is just unhappy. It best mowed just under 1", but 1.5" maximum. It needs to be mowed at least once a week, but probably 2X per week. Fertilize with nitrogen every 30-45 days during the summer and water 1" per week preferably all at once. Don't water again until it shows signs of stress (curling, wilting or graying leaves). Read, learn and love the link below. It will be your salvatiu\on. Here is a link that might be useful: Bermuda Bible

If you have had plenty of water, the only two other reasons that grass turns brown is fungal disease or insects. You might dig up a full square foot of the sod somewhere where it is browned out looking for grub worms. They are about the size of your thumb and have a C shape. If you have more than a dozen in the 1-square foot area, then that's the problem and you can treat for grub worms. If you have a lot fewer, then the problem is disease. The problem with treating for disease with chemicals is that you have to figure out which disease it is or you'll get the wrong treatment. One of the reasons I started gardening organically is that the treatment for disease is usually the same: corn meal. Yes, ordinary corn meal (like what you cook with) grows a predatory fungus that kills the disease fungus. It takes 3 full weeks to work but it works most of the time. I see you have a mix of grasses and plants (weeds???) in the lawn. One of the excellent reasons to have a mix is that not all the grass or plants will be affected by any single disaster. You can probably leave yours alone and it will fill back in with something. You might consider sowing Dutch white clover seed over the entire lawn. It is a hassle free ground cover, especially when mixed with other grasses and plants.

"...it won't help anything " and I'll add that adding salt to the soil can be damaging. And please....do not use any pesticide until you have carefully read and understood all of the directions. Also, home remedies shouldn't be used unless there is a good understanding of how they work, possible problems, and potential damage. Repeating jean again....don't use anything unless you know just what the problem is.

The label will tell you to wait a week. If you can wait that long, then wait a week. But in reality, you can reseed right away because Roundup only works through plant foliage, which seeds don't have.