Internal error

Can someone help me ?
I have a strange problem with my Elastix.
First, when I launch Elastix I Have no picture in the first page

If I refresh my screen I have just one pictures, if I do it again i can have three pictures

And sometime I have all the pictures.

Most of the time I cannot access to the reports menu through freepbx. If I am lucky I can see it just once and never again, I still have this message:

"Internal Server Error

The server encountered an internal error or misconfiguration and was unable to complete your request.

Please contact the server administrator, [email protected] e-mail address is being protected from spam bots, you need JavaScript enabled to view it and inform them of the time the error occurred, and anything you might have done that may have caused the error.

More information about this error may be available in the server error log."

when I check the error log file I have this:

“Premature end of script headers: php-cgi, referer:

I have the same trouble with the sub-menu “monitoring”

If I try to make a backup it is the same.

I am wondering if it is not a file access problem or a Corrupted file or something else. I don’t know.

Please can somebody help me ?

Right now I don’t know what to do anymore.

Thanks in advance for your solutions.