Some web just not loading (1 reply)

I've searched the forum but couldn't find any answers.

I'm running Wampserver 3.13 on a windows 10 Home computer. About says this:
Apache 2.4.27 - PHP 5.6.31
MySQL 5.7.19
MariaDB 10.2.8
PHP 5.6.31 for CLI (Command-Line Interface)

I have several webs running om this wamp server. All for development. Tops 3-4 user at same time, mostly only two. Problem is that quite often one of the webs wil not just load and an error message is displayed. When trying spesific files I found that readme.html loads just fine, but not php files. To solve this I've been fiddling around trying many different things. Rerstarting computer, restarting server etc.

I really is not knowing what I'm doing here, and why this is happening. Is this a common problem other have experienced and is there any easy solution? Would love to understand why and how.

I have no knowledge in php programming. Used to write asp websides with access og slq server for more than 10 years ago, så I have a basic programming understanding. Last years dealing with html and css mostly.

Hope somebody can help.

Regards Trond