SOS !!!

We recently had two important Access DBs crashed (on about 2.5 Mb long, the other about 5 Mb long) onto our NW 3.12 server.

* There wasn't any electricity problem both onto the server and the stations.
* Disks aren't full
* Apparently, users weren't doing strange manipulation. it seems that incident occured during compaction, for the second DB, and during an importation program for the first one.

Any suggestions ?
Thanks