Do not understand why this happens

HI.

I connect to the database using the PGDAC, and then send a NOTIFY to
myself every minute. In this case, the logs get that.

2013-03-10 10:34:36 19797 LOG: process 19797 still waiting for
AccessExclusiveLock on object 0 of class 1262 of database 0 after
3000.100 ms
2013-03-10 10:34:36 19797 STATEMENT: NOTIFY test105, ''
2013-03-10 10:34:37 19797 LOG: process 19797 acquired
AccessExclusiveLock on object 0 of class 1262 of database 0 after
3315.206 ms
2013-03-10 10:34:37 19797 STATEMENT: NOTIFY test105, ''
2013-03-10 10:34:37 19797 LOG: duration: 3315.322 ms statement:
NOTIFY test105, ''
2013-03-10 14:27:43 19797 LOG: could not receive data from client:
Connection reset by peer
2013-03-10 14:27:43 19797 LOG: unexpected EOF on client connection

Tell me what's the problem?

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