My hosting COmpany wrote me that they will off my site if I will not improve this issue. I looked in logs error and so many time written
mod_hostinglimits:Error on LVE enter: LVE(628) HANDLER(x-httpd-php5) HOSTNAME(mevicer.com) URL(/engine/rss.php) TID(742659) errno (7)
firs time I turned off rss feed Becouse I thought it need more resourses, but not helped