Content from main page is gone

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Hi, when editing my home page I got this error several times:
Fatal error: Maximum execution time of 30 seconds exceeded in /web/space1/34/3449/web/updates/concrete5.4.2.1/concrete/libraries/3rdparty/Zend/Cache/Backend/File.php on line 654

I was wondering what caused the error, ist this something to do with my server or with my page?

Usually I just reloaded the page and then it worked fine. Last time I did it it returned a completely empty page - all content was gone even the nav bar on top.
I then went to page versions and approved some older versions. While for a normal user the page is now there in the old version, in edit mode I still get the blank page.

Can anyone tell me what to do so that this won't happen again, and why is it happening in the first place?
Thxs a lot

rritz
 
Mnkras replied on at Permalink Reply
Mnkras
try disabling and clearing the cache
rritz replied on at Permalink Reply
rritz
I did this but don't if it helped.
I had to rebuild the page from scratch. Now I got the same error again, only this time it said line 1003
In line 1003 there's
[ return preg_replace('~^' . $prefix . '---(.*)$~', '$1', $fileName); ]

as there is a different line every time, I guess just changing the max execution time is not the answer ... there is no execution time mentioned at all here

Can anyone tell me what is happening? If I could only understand