Every morning I need to restart samba service on my sogo test server.

Without this operation, I can't connect with outlook.
This is only test server, that not receive or send mail during night.

Today I see this rows in samba log:

2013-05-13 07:54:10.841 samba[2436] <MySQL4Channel[0x0x17ffc00] connection=0x0x2116900> SQL: SELECT count(*) FROM socfs_sogo1;
2013-05-13 07:54:10.861 samba[2436] <MySQL4Channel[0x0x17ffc00] connection=0x0x2116900> ERROR: MySQL server has gone away
2013-05-13 07:54:10.861 samba[2436] <MySQL4Channel[0x0x17ffc00] connection=0x0x2116900> SQL: CREATE TABLE socfs_sogo1 ( c_path VARCHAR(255) PRIMARY KEY, c_parent_path VARCHAR(255), c_type TINYINT NOT NULL, c_creationdate INT NOT NULL, c_lastmodified INT NOT NULL, c_version INT NOT NULL DEFAULT 0, c_deleted TINYINT NOT NULL DEFAULT 0, c_content LONGTEXT);
2013-05-13 07:54:10.861 samba[2436] <MySQL4Channel[0x0x17ffc00] connection=0x0x2116900> ERROR: MySQL server has gone away
/usr/sbin/samba: Uncaught exception MAPIStoreIOException, reason: could not create special table 'socfs_sogo1'
[2013/05/13 07:54:11, 0] mapiproxy/servers/default/nspi/dcesrv_exchange_nsp.c:1394(dcesrv_exchange_nsp_unbind)
dcesrv_exchange_nsp_unbind

Maybe with no activity on server, samba lost connection with mysql and need restart to work correctly.