Starting Database 'XXXXX' Often In Logs

Hi,

I've got a sitatuation where one of our sql databases appears to be frequently "starting". The log entry looks like:

Starting up database 'Database'.

And seems to occur at irregular intervals and does not seem to be inline with any other db activity....i.e. transaction log backups, insertions or reads.

This DB is fairly busy receving inserts from our PBX CTI software almost constantly.

Note this is the only DB on the server displaying this behaviour (we've got two named instances running with several databases in each).

Any help / pointers appreciated.

Rgds,
SLE