My friend asked me about a problem on her Android phone with Whatsapp.
Phone is Huawei, Y330-U01; Android 4.2.2. No apps related to Cloud (see comments below) except latest versions of Google Drive and Huawei backup.
People send her pictures and they look fine the first time, but if she tries to open them the second time, they are "blurred" (her words). She showed me one, and what is happening is that they have been degraded to something like twenty or thirty pixels wide! Like TV stations do when nudity is on the screen--only far worse, like a whole person three blocks wide!
And videos that play the first time only, the second time cannot play at all.
I suspected some function was degrading them to save storage space, but the internal storage has almost a gigabyte available, and there is an SD card with almost four GB.
She had a lot of updates pending, but neither Whatsapp nor the O.S. were on the list.
What might be the cause and how to fix?