I don't see a real problem. On hot days the leaves will naturally curl and droop. That is entirely normal in the heat of the day. If they are droopy in the morning, then they are either dry or are dying because they were watered too much. Both conditions look the same at first. Being too wet is eventually fatal.

The dead dry leaves look like leaves that are 2 or 3 years old and are being shed from older branches. That is normal and natural.

Err on the side of not enough water. If they are dry in the morning, then water thoroughly. With a good mulch, watering is not needed too often.

Cut off the bunch of 3 or so leaves that look like they are dying. That could be a borer or some other localized problem. It is best to remove it before it can affect the rest of the plant.

Here is a link that might be useful: Common Problems and Their Solutions.

Thanks rhodyman. As I was taking off that bunch of brown leaves, the whole branch came off. I bent over to look at the other rhode and saw a yellow/brown bunch there too, and that whole branch came off. Weird. I am definitely going to stop watering so much. They weren't wilty this morning so I think I'm ok. Thanks again for your help!

Came off. I'm not sure I understand. Torn, jagged, or soft tissue that was limp? Could it had been broken, possibly as it was being installed a month ago?

It was soft tissue, kind of just easily came off when I pulled it. I guess I didn't think of that, that it may have been broken and eventually just died.. hmm. I guess I'm worrying too much :) Thanks again everyone.

If it was hollow where it broke easily, it is borers. There isn't a lot you can do for borers. Just make sure that any you find are killed and hope you don't get more.