Can you help me with an Android phone quirk?

I have a Samsung Galaxy S III Android smart phone. A few days ago, there was an automatic upgrade from Android OS 4.2 to 4.3.

Since the upgrade, my phone has been downloading six photos that I took seven months ago at least twice each day. It has also been downloading a document in .pdf format that I sent to my phone last year. It’s doing this twice every day.

I tried simply clearing the notifications of the downloads, and it will download them again later in the day. I tried clicking each new download and saving the pictures again. It still downloads them again later in the day.

It’s only an annoyance. The phone works perfectly otherwise.

Do you know how I can get it to stop these repetitious downloads?