The only way to prevent APP that moves to SDcard missing/malfunction after you re-mount the SDcard is to change the setting by following steps:
- Under "file manager" > select "settings"> check the “show hidden files/folders”
- Once checked, the “.android_secure” folder will be displayed under Internal storage list to ensure this funciton has been turned on.
- Mount your SD card.
- Select an App to move to SD card.
- Once you unmounts and re-insert the SD card, you will need to re-start your tablet for the app to function properly.