[Koha] KOHA is frequently giving following error

[Vinod Kumar Mishra]

Dear All,

KOHA is frequently giving following error. after reboot, it works fine for few hours then again gives below error.
-------------------------------------------------
Software error:

Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (111) at /usr/share/koha/lib/C4/Context.pm line 803.
BEGIN failed--compilation aborted at /usr/share/koha/lib/C4/Auth.pm line 65.
Compilation failed in require at /usr/share/koha/opac/cgi-bin/opac/opac-main.pl line 22.
BEGIN failed--compilation aborted at /usr/share/koha/opac/cgi-bin/opac/opac-main.pl line 22.

For help, please send mail to the webmaster ([no address given]), giving this error message and the time and date of the error.

Version: 3.14
OS: Ubuntu 12.04

With regards,
Vinod Kumar Mishra,
Assistant Librarian,
(Library In-Charge)
Biju Patnaik Central Library,
NIT Rourkela,
Mob:91+9439420860
    91+6612462103 (O)
email: vinod_librarian at rediffmail.com
     : mishravk79 at gmail.com