Up till now, I've been using Sungpil Jang's Wallpaper Changer and has always worked perfectly. However, for the past week or so, it will run for a while, then just stop, as if the service is removed from device memory. I saw one other complaint about this in the app's reviews, so I don't think it's my phone. Does anyone here use a wallpaper randomizer that works consistently? Thank you.