[Freeswitch-users] freeswitch's db error: took too long to complete

Hi all, I installed freeswitch and postgresql on amazon ec2, after 1 day or 2 days, the following error occurred: switch_pgsql.c:359 Query (delete from interfaces where type='api' and name='start_local_stream' and hostname='fs01') took too long to complete or database not responding. I have to shutdown freeswitch and restart it. There is no problem on our physic machine with same configuration, only happened on amazon ec2.Anyone encountered similar problems ?