Default app shortcuts disappear

Hi, my shortcut for my apps on the home screens keep disappearing,im on stock jb.evertime it happens,7-8 apps go missing,have to add them again,very annoying.anyone else have this problem. only happens to dled apps,never the stock google/lg apps.i dont power off or reset,just come back from sleep and its gone,happens once every couple of days.its random apps everytime.

Thanks