Please correct the following errors before continuing: Failed to connect to MySQL: Connection timed

Hello,

i am using WHMCS 6.3.1

Since 1-2 day i get the Error once in the cart the "continue" button clicked, than after 2 min.:

Please correct the following errors before continuing:

Failed to connect to MySQL: Connection timed out

Screeshot: http://prntscr.com/ez1iit

Please note, all other WHMCS funtions works fine, so the access to mysql active and also works.

There was also no changes since past last month on the basic WHMCS System.

How can i get out the MySQL Errors, if i activate the "SQL Debug Mode" ?

Or how can solve this issue basically ?

Kind Regards

Hi StreamingServers,

Hmm, are you using an out of the box theme? What is your PHP Memory Limits & Timeout settings?