This is regarding the exchange server 2007
Automatically the exchange server services information store stopping, if see the event the 9002 error waring occurs Service MSExchangeMailboxAssistants. Stopped processing database First Storage Group/Mailbox Database (97a5cb22-99cd-4d23-8033-3d9de8e06da2).
Everyday in the night this happening then i need to start the information store service manually.
Suggest me how to resolve the problem