hi all, i want to ask about Plesk server

I'm using vbb version 3.5.4 and server Plesk 7.5.6 for Windows.
I don't know why sometimes my server is down, is shows sometext with:
Fatal error: Maximum execution time of 30 seconds exceeded in C:\Inetpub\vhosts\mydomain.com\httpdocs\diendan\i ncludes\class_core.php on line 279
or
Fatal error: Maximum execution time of 30 seconds exceeded in C:\Inetpub\vhosts\mydomain.com\httpdocs\diendan\i ncludes\class_core.php on line 2885

or on Server, MySQL is automaticality shut down (of course vbb database is error ) - This way to turn on MySQL: => Server -> Service managment -> MySQL Server -> and Green input

How do I fix these problems?
thank you and sorry for my bad English

[Ntfu2]

I'm not familiar with plesk, but in your php.ini file there should be a max_execution_time variable or something similar, raise the limit to 60. That will get rid of that error. But you need to find our which script and why its taking longer then 30 seconds to execute first.

If MySQL is automatically shutting down, then you have some configuration issues. Try emailing your hosting company and tell them that MySQL keeps crashing, and see if they can look into it for you.