SQL Database Error Messing Up Random Posts

Hello everyone! I have had this error for about a month now but a random post(s) gets completely deleted and this is what pop ups:

Warning: mysql_connect() [function.mysql-connect]: Can’t connect to local MySQL server through socket ‘/var/lib/mysql/mysql.sock’ (2) in /home/rankable/public_html/linkX/mysql.class.php on line 50

Warning: mysql_real_escape_string() [function.mysql-real-escape-string]: Can’t connect to local MySQL server through socket ‘/var/lib/mysql/mysql.sock’ (2) in /home/rankable/public_html/linkX/mysql.class.php on line 70

Warning: mysql_real_escape_string() [function.mysql-real-escape-string]: A link to the server could not be established in /home/rankable/public_html/linkX/mysql.class.php on line 70

Warning: mysql_query() [function.mysql-query]: Can’t connect to local MySQL server through socket ‘/var/lib/mysql/mysql.sock’ (2) in /home/rankable/public_html/linkX/mysql.class.php on line 75

Warning: mysql_query() [function.mysql-query]: A link to the server could not be established in /home/rankable/public_html/linkX/mysql.class.php on line 75
QUERY ERROR: SELECT * FROM <code>domain</code> WHERE <code>domain</code> LIKE ”

Fatal error: Uncaught exception ‘Exception’ with message ‘Query failed: Can’t connect to local MySQL server through socket ‘/var/lib/mysql/mysql.sock’ (2)’ in /home/rankable/public_html/linkX/mysql.class.php:77
Stack trace:
#0 [internal function]: Database_MySQL->query(‘SELECT * FROM

…’, ‘mywebsite.com’)
#1 /home/rankable/public_html/linkX/mysql.class.php(57): call_user_func_array(Array, Array)
#2 /home/rankable/public_html/linkX/mysql.class.php(112): Database_MySQL->setQuery(Array)
#3 /home/rankable/public_html/linkX/XLink.php(4): Database_MySQL->getRow(‘SELECT * FROM `…’, ‘mywebsite.com’)
#4 {main}
thrown in /home/rankable/public_html/linkX/mysql.class.php on line 77`

I have no idea how to fix this so any help would be amazing ??

Thank you!