Icon Appears disappears Strange Behaviour of Application!!!

Hi All
    I am facing a strange problem on my Nokia 9300.I have installed an application on the MMC card and sometimes the icon comes and sometimes it just vanishes The application is otherwise behaving normally .  After rebooting it comes again so its behaving in a ad hoc way. I ran the application on 9500 the problem occurs on it as well.    Any ideas where things are geting wrong