Site suddenly very slow

Front end is suddenly very slow, back-end works normal.

errors.log shows thousands of the following lines:

Warning: SQL query can't be run, it isn't table name selected on line# (file: )
Warning: SQL query can't be run, it isn't table name selected on line# (file: )
Warning: SQL query can't be run, it isn't table name selected on line# (file: )
Warning: SQL query can't be run, it isn't table name selected on line# (file: )
Warning: SQL query can't be run, it isn't table name selected on line# (file: )
Warning: SQL query can't be run, it isn't table name selected on line# (file: )
Warning: SQL query can't be run, it isn't table name selected on line# (file: )
Warning: SQL query can't be run, it isn't table name selected on line# (file: )
Warning: SQL query can't be run, it isn't table name selected on line# (file: )

Please help!

Same to me too. I submitted ticket and do all research to troubleshoot but no solutions.

Done:
CHMOD folders 777, 755
Check MySQL, Check server, check firewall - fine
Read and did http://www.flynax.com/forum/showthre...=reefless+line
Active & Inactive all plugins

No improvement. Don't know what's goes wrong