[isf-wifidog] Unable to connect to database on localhost (sometimes)

[Docfear Docfear]

hellomy server was doing ok and now i started getting this error( sometimes only )but when i refresh the page, it works ok againcan someone tell what could this bethanksJuanFatal error: Uncaught exception 'Exception' with message 'Unable
to connect to database on localhost' in
/home/lavals/public_html/auth1/wifidog-auth/wifidog/classes/AbstractDb.php:96
Stack trace:
#0
/home/lavals/public_html/auth1/wifidog-auth/wifidog/classes/AbstractDb.php(321):
AbstractDb->connect(NULL)
#1
/home/lavals/public_html/auth1/wifidog-auth/wifidog/classes/Server.php(227):
AbstractDb->execSqlUniqueRes('SELECT server_i...', NULL, false,
true)
#2
/home/lavals/public_html/auth1/wifidog-auth/wifidog/include/common.php(107):
Server::getCurrentServer(true)
#3 /home/lavals/public_html/auth1/wifidog-auth/wifidog/index.php(52):
require_once('/home/lavals/pu...')
#4 {main} thrown in /home/lavals/public_html/auth1/wifidog-auth/wifidog/classes/AbstractDb.php on line 96
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