wp-admin blank screen

Hi guys,

This morning. when I tried to log in, my wp-admin was suddenly blank, the website works fine (yesterday evening no new addons installed) and everything worked fine.

Logging in using wp-login.php worked as well and I co do my admin stuff. However, the moment I edited a page or plugin settings, and clicked publish or save settings I would get the blank screen again. GOing back to wp-admin via url would give me the admin screen again and the page settings were saved so it worked.

TLDR;
-going to wp-admin to login gives a blank screen.
-wp-login.php works, after that wp-admin works as well.
-Saving after editing a page works, but gives me a blank screen as well.

hope you guys can help me because this grinds my gears.

Cheers,
Jasper