I urge you to be proactive and figure out why the service is hanging. This should not be happening regularly. Troll the application event logs and note any errors (or warnings) from the Microsoft Exchange information store approaching the time the service hangs. Then either write back to us or search TechNet in order to get some clues on what's going wrong. Then you can resolve the root cause.
Do you have comments on this Ask the Expert Q&A? Let us know.
Related information from SearchExchange.com:
Dig Deeper on Exchange Server setup and troubleshooting
Have a question for an expert?
Please add a title for your question
Get answers from a TechTarget expert on whatever's puzzling you.