MySQL on ubuntu respawning every 30s

Since I don't know if it's apropriate to ask a question in another one, I opened a new one- I probably have the same problem as here: mysql server restarts every 30 seconds

BUT: My MaSQL is not logging an config error (in fact, I thinke something IS broken in the configuration, because he's not logging at all. But he starts up (and I can connect/use it) but the server gets really slow, and after some time, he's not responding anymore and has to be hard reset.

Can someone please help me checking the config-file? I'll put it below- Good tho know: It's a multi-instance setup. At least instance 2 has that problem

It's an Ubuntu 10.10, MySQL 5.1. My Syslog looks like this:

Jan 16 10:03:06 testing2 init: mysql main process (22245) terminated with status 1
Jan 16 10:03:06 testing2 init: mysql main process ended, respawning
Jan 16 10:03:37 testing2 init: mysql post-start process (22246) terminated with status 1
Jan 16 10:03:37 testing2 init: mysql main process (22314) terminated with status 1
Jan 16 10:03:37 testing2 init: mysql main process ended, respawning
Jan 16 10:04:07 testing2 init: mysql post-start process (22315) terminated with status 1
Jan 16 10:04:08 testing2 init: mysql main process (22383) terminated with status 1
Jan 16 10:04:08 testing2 init: mysql main process ended, respawning
Jan 16 10:04:38 testing2 init: mysql post-start process (22384) terminated with status 1
Jan 16 10:04:39 testing2 init: mysql main process (22452) terminated with status 1
Jan 16 10:04:39 testing2 init: mysql main process ended, respawning
Jan 16 10:05:01 testing2 CRON[22519]: (root) CMD (command -v debian-sa1 > /dev/null &&     debian-sa1 1 1)
Jan 16 10:05:09 testing2 init: mysql post-start process (22453) terminated with status 1
Jan 16 10:05:09 testing2 init: mysql main process (22540) terminated with status 1
Jan 16 10:05:09 testing2 init: mysql main process ended, respawning

Conf:

[mysqld_multi]
mysqld     = /usr/sbin/mysqld
mysqladmin = /usr/bin/mysqladmin
user     = debian-sys-maint
password = iYOO9xwrplvgTG5D

[mysqld1]
user            = mysql
pid-file        = /export/dat/mysql/mysqld1/mysqld.pid
socket          = /export/dat/mysql/mysqld1/mysqld.sock
port            = 3307
basedir         = /usr
datadir         = /export/dat/mysql/mysqld1/data
#tmpdir         = /tmp/mysqld1
tmpdir          = /export1/mysqltmp/mysqld1
language        = /usr/share/mysql/english
log             = /var/log/mysql/mysql1.log
log-error       = /var/log/mysql/mysql1.error
skip-external-locking
key_buffer      = 16M
max_allowed_packet  = 64M
thread_stack        = 128K
thread_cache_size   = 8
query_cache_limit       = 1M
query_cache_size        = 256M
expire_logs_days    = 10
max_binlog_size         = 100M
character_set_server    =utf8
default-character-set   =utf8
innodb_buffer_pool_size =700M
innodb_additional_mem_pool_size=10M
innodb_log_file_size    =100M
innodb_log_buffer_size  =4M
innodb_flush_log_at_trx_commit=0
innodb_data_home_dir    =/export/dat/mysql/mysqld1/innodbfiles
innodb_file_per_table
lower_case_table_names=1 
table_cache=512
tmp_table_size=18M
innodb_flush_log_at_trx_commit=0
innodb_thread_concurrency=8

# Log slow queries, time threshold set by 'long_query_time',
#log_slow_queries = /var/log/mysql_query.log
#log_output                        = FILE                    # 5.1 only
#long_query_time = 5

ignore_builtin_innodb
plugin-load=innodb=ha_innodb_plugin.so;innodb_trx=ha_innodb_plugin.so;innodb_locks=ha_innodb_plugin.so;innodb_lock_waits=ha_innodb_plugin.so;innodb_cmp=ha_innodb_plugin.so;innodb_cmp_reset=ha_innodb_plugin.so;innodb_cmpmem=ha_innodb_plugin.so;innodb_cmpmem_reset=ha_innodb_plugin.so

default-storage-engine=InnoDB
innodb_file_per_table=1
innodb_file_format=barracuda
innodb_strict_mode=1


[mysqld2]
user            = mysql
pid-file        = /export/dat/mysql/mysqld2/mysqld.pid
socket          = /export/dat/mysql/mysqld2/mysqld.sock
port            = 3306
basedir         = /usr
datadir         = /export/dat/mysql/mysqld2/data
#tmpdir         = /tmp/mysqld2

tmpdir          = /export1/mysqltmp/mysqld2
language        = /usr/share/mysql/english
log             = /var/log/mysql/mysql2.log
log-error       = /var/log/mysql/mysql2.error
skip-external-locking
key_buffer      = 16M
max_allowed_packet  = 64M
thread_stack        = 128K
thread_cache_size   = 8
query_cache_limit       = 1M
query_cache_size        = 256M
expire_logs_days    = 10
max_binlog_size         = 100M
character_set_server    =utf8
default-character-set   =utf8
innodb_buffer_pool_size =700M
innodb_additional_mem_pool_size=10M
innodb_log_file_size    =100M
innodb_log_buffer_size  =4M
innodb_flush_log_at_trx_commit=0
loose_innodb_data_home_dir      =/export/dat/mysql/mysqld2/innodbfiles
#innodb_file_per_table
lower_case_table_names=1 
table_cache=512
tmp_table_size=18M
innodb_flush_log_at_trx_commit=0
innodb_thread_concurrency=8

# Log slow queries, time threshold set by 'long_query_time',
#log_slow_queries = /var/log/mysql_query.log
#log_output                        = FILE                    # 5.1 only
#long_query_time = 3

ignore_builtin_innodb
plugin-load=innodb=ha_innodb_plugin.so;innodb_trx=ha_innodb_plugin.so;innodb_locks=ha_innodb_plugin.so;innodb_lock_waits=ha_innodb_plugin.so;innodb_cmp=ha_innodb_plugin.so;innodb_cmp_reset=ha_innodb_plugin.so;innodb_cmpmem=ha_innodb_plugin.so;innodb_cmpmem_reset=ha_innodb_plugin.so

default-storage-engine=InnoDB
innodb_file_per_table=1
innodb_file_format=barracuda
innodb_strict_mode=1

Thanks