[Serusers] SER 0.9.6 and MySQL connection failed

Hi all, I'm running SER 0.9.6 on a Debian Etch, compiled it from source, using etch's libmysqlclient5 to connect a mysql server 5.0.20 (running on a different server, but on the same LAN) modparam("usrloc", "db_mode", 1) modparam("usrloc", "timer_interval", 10) modparam("usrloc", "use_domain", 1) modparam("usrloc", "db_url", "mysql://ser:xxxxx@x.x.x.x:3306/ser") When I start SER, everything seems to be fine for a while. After about one day, when I unplug my UAC and the registration expires, SER can not remove it from the database because it says: Oct 18 14:47:07 sip ser[21813]: Binding '1111111@1.2.3.4','sip:1111111@2.3.4.5:1164' has expired Oct 18 14:47:07 sip ser[21813]: submit_query(): mysql_ping failed Oct 18 14:47:07 sip ser[21813]: submit_query(): MySQL server has gone away Oct 18 14:47:07 sip ser[21813]: db_delete: Error while submitting query Oct 18 14:47:07 sip ser[21813]: db_del_ucontact(): Error while deleting from database Oct 18 14:47:07 sip ser[21813]: wt_timer(): Error while deleting contact from database If I restart SER, everything works fine (for a while) again. I'm sure that _NO_ONE_ was restarted the MySQL server during the test period. I can reproduce it at any time. Is it a known issue, or do I have a special case ? Every comments are welcome. Thanks, Mitya