Disappearing app icons on the iPhone

Recently, I noticed that icons are disappearing from my iPhone. I went to start my favorite streaming radio app, Wunder Radio, and it was gone. I thought maybe I had deleted it by accident, so I went into the app store to get another copy. It claimed that the app was installed already. Am I alone in this?

UPDATE: I had 9 full pages of apps on my iPhone (I know, I know)! I set some not to sync to the phone and my missing apps returned. User error! Gotta love it!