After upgrading to 184.108.40.206 i have the following errors to apache server log
Got error 'PHP message: PHP Warning: PDO::query(): MySQL server has gone away in ../public_html/classes/db/DbPDO.php on line 147\nPHP
PHP Warning: PDO::query(): Error reading result set's header in ../public_html/classes/db/DbPDO.php on line 147\n
AH01071: Got error 'PHP message: PHP Fatal error: Out of memory (allocated 39845888) (tried to allocate 20480 bytes) in ../public_html/classes/cache/CacheMemcached.php on line 114\n'
that causing very often to have 500 and 502 errors.