Would be easier to comment if we could see the whole plant, complete with a shot of potting medium.

...and overwatering is menacing enough :) - if plant starts rotting because of it, it could die just as from other disease.

Here's an arial view of the entire plant - growth at the top looks great, stems are still hard as opposed to soft/squishy, but leaves in the middle of some of the stems are falling off (most noticeable in top left stem). I'm hoping it'll recover :/

Sorry to ask, but could you also post a photo of whole plant? - straight on, not top view pls.

Are there many leaves that are falling off?

How long have you had this plant and where are you growing it? I think there was a change in growing conditions early in spring......like if the plant was brought inside to outside in stronger sun. The top leaves at that time got sunburned/damaged. The plant continued to grow throughout summer, and those leaves which were damaged are now in the ones you see that are falling off, while the leaves below and newer leaves above that are fine. The plant looks quite healthy to me.....continue doing as you are doing!

=)

Yes, I agree it looks quite healthy!

I also agree additional photos would help & that growing conditions have changed, since it appears problem resolved.

Aerial views are great for checking for general health of plant, however, if there's an area particularly affected, we'd like to see what you're seeing too.

From the look of the rest of the plant, all looks good to me!

Is that a bagged succulent mix in the pot?