FREQUENTLY DB CRASHES VIA DROPBOX SYNC

[Dausto]

Hi,
I'm using mmex for Mac Osx and mobile for Android in my Galxy s III mini, syncing via DropBox.
Database often crashes, especially after entering data from Android and after opening it in MacOsx:
"Erros11 SQLLITE_CORRUPT[11]: database disk image is malformed"
and I lose all my data...!!!

I only enter data if under wifi coverage, to be sure that dropbox will sync.
What can I do?
Before opening MMEX, I make sure that when I login into iMac Dropbox has synchronized, but this does not avoid the problem.
Any idea?
I think that syncing at moment has not warranty...