Randomly not generated whole page

[sajlent]

I bump into a weird problem. Randomly a page is not fully generated. When I reload a page most of the time it's OK but sometimes (without any apparent logic) only a part is generated and sometimes some PHP errors appear (about missing functions, unfisnished regexp etc.) as though some scripts were not properly parsed or loaded. The application itself ran without any problems on other two servers. The server where the problem occurs is FreeBSD, PHP4 with AfterBurner accelerator. Unfortunately, I don't have access to the server, so I cannot check further settings and logs.
Does anybody have an idea what can be going on? Any suggestions are welcommed! Than you a lot!

[greenie2600]

Does any of your code use variables that might change from page load to page load - for example, randomly generated values, timestamps, or information retrieved from a database?

[sajlent]

Yes, it uses data from DB.