database IO Frozen for snapshot

Hi All,

How To resolve this issue.

After happening this SSMS Is not responding for connections. it's hanging.

once we restart the server it is working.

Please suggest the solution.

2014-08-24 00:11:02.78 spid65 Database master: IO is frozen for snapshot

2014-08-24 00:11:02.84 spid66 Database model: IO is frozen for snapshot

2014-08-24 00:11:02.89 spid67 Database model: IO is frozen for snapshot

Thanks in advance...