Vanishing Pinned Tiles

I'm still trying to track this one down. On my screen, I have no empty spaces for the apps I've pinned but every few days or so I look and notice a tile has vanished. This time it was oddly enough my "Flyby" app tile, but others have simply vanished from my 920 screen. I can't say if it is the coordinates of the tile because it seems to be from the same generally area affected, or something else. I just installed 3 new apps today so could it be related to that? I have to watch. Not the end of the world but its weird.

I have one that disappears a few moments after I pin it. Its actually still there, but invisible.

Sent from my Nexus 4 using Tapatalk 2

Some of them vanish for me after i update the app. I know flyby got updated yesterday so maybe that's why ?

I suspect that might be with it is Paulsalame. I had another icon drop today but not after an update. I installed a new app on my phone. I also uninstalled an app ( the app I had just installed ) so I still can't say what's causing it.