Из-за чего падает соединение с Sphinx?

MySQL server has gone away

indexer
{
	mem_limit				= 2048M
	lemmatizer_cache		= 1024M
}

common
{
	lemmatizer_base			= /etc/sphinx/dicts
}

searchd
{
	listen					= 9312
	listen					= 127.0.0.1:9306:mysql41
	pid_file 				= /var/run/sphinx/searchd.pid

	binlog_path				= /var/lib/sphinx
	binlog_flush			= 2
	binlog_max_log_size		= 512M
	log						= /var/log/sphinx/searchd.log
	query_log				= /var/log/sphinx/query.log
	rt_flush_period			= 300

	read_timeout			= 5
	max_children			= 200
	client_timeout			= 300
	seamless_rotate			= 1
	preopen_indexes			= 1
	unlink_old				= 1
	workers					= threads

	max_filters				= 256
	max_packet_size			= 8M
	mva_updates_pool		= 1M
	max_filter_values		= 4096
	max_batch_queries		= 32

	collation_server		= utf8_general_ci
	collation_libc_locale	= ru_RU.UTF-8
}


index testingIndex
{
	type				= rt
	path				= /var/lib/sphinx/testing
	rt_mem_limit		= 1024M

	rt_attr_uint		= table_id
	rt_attr_string		= table_name
	rt_attr_string		= is_status
	rt_field			= name

	mlock 				= 0
	dict				= keywords
	docinfo				= extern
	html_strip			= 1
	min_prefix_len		= 1
	expand_keywords		= 1
	index_exact_words	= 1
	morphology			= lemmatize_ru_all
}