I cant keep the slave up for more than 10 minutes

constantly getting these errors

040812 10:32:25 Error reading packet from server: binlog truncated in the middle of event (server_errno=1236)
040812 10:32:25 Got fatal error 1236: 'binlog truncated in the middle of event' from master when reading data from binary log
040812 10:32:25 Slave I/O thread exiting, read up to log 'FINANCE-bin.185', position 284963878


both servers have plenty of free space

Here is the master setup..
skip-locking
set-variable= key_buffer_size=1000M
set-variable=bulk_insert_buffer_size=256M
set-variable=delay_key_write=ALL
set-variable=join_buffer_size=256M
set-variable= max_allowed_packet=256M
set-variable= table_cache=512
set-variable= sort_buffer_size=256M
set-variable=tmp_table_size=256M
set-variable= record_buffer=256M
set-variable= thread_cache=8
set-variable=myisam_sort_buffer_size=256M
myisam-recover=BACKUP,FORCE
set-variable=read_buffer_size=256M
set-variable=interactive_timeout=7200
set-variable=wait_timeout=7200

here is the slave setup

skip-locking
set-variable= key_buffer_size=1500M
set-variable=bulk_insert_buffer_size=512M
set-variable=delay_key_write=ALL
set-variable=join_buffer_size=512M
set-variable= max_allowed_packet=384M
set-variable= table_cache=512
set-variable= sort_buffer_size=256M
set-variable=tmp_table_size=400M
set-variable= record_buffer=384M
set-variable= thread_cache=8
set-variable=myisam_sort_buffer_size=256M
myisam-recover=BACKUP,FORCE
set-variable=read_buffer_size=384M
set-variable=interactive_timeout=7200
set-variable=wait_timeout=7200

I'm out of ideas, I've played with buffer sizes, packet sizes, but still get the same error

my other master/slave has no problems at all, the slave is the same server (one box that's slave for two sites)

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