wp-config.php corrupt after every login

Hi,

I’ve set my mind weeks ago to get acquainted with WordPress. Here’s (or in a way, was) the thing…
I had no issues configuring a local install (I’m not a total newbie). So, I’ve been playing around in wordpress with themes, plugins, custom css, etc.. trying some cool things. But after quitting my locally installed site and trying to get back where I was, most of the times the WP UI had disappeared for all of the different testsites I had created. There was no black bar on top, no dashboard, nothing. The sites would run and behave like I left them. But it was impossible to continue editing by the absence of the header bar (site title, customize etc,…). This occurred to me almost everytime.
After many trial and errors with different versions and reinstalls of wamp, mamp, wordpress, themes, etc… I finally found out that the wp-config.php gets somehow corrupted. Even the wp-config-sample.php is somehow affected. Anyhow, my current solution exists of deleting both wp-config files, copy the wp-config-sample.php file from a clean, unconfigured WP-folder into my local site-folder and after logging in into PHP and then into WP, I finally can continue.
I’m quite sure many folks out there must have had the same issue. Since I’m not yet so familiar with the support forum and topics, I might be looking for a solution in the wrong place or so.
For the time being, I have a temporary workaround and I finally can move on diving into WordPress. It would be very kind if someone could provide me a lasting solution.