Same problem here after the update a few weeks ago. After countless attempts, it worked only one time for me. It started to fail after the update a few weeks ago.
Provider: https://www.transip.nl (as well), plugins:
Akismet Version 3.2
All-in-One WP Migration Version 6.40
Contact Form 7 Version 4.6.1
Duplicate Post Version 3.1.2
Header and Footer Version 2.0.3
LayerSlider WP Version 5.6.9
Maintenance Mode Free Version 1.2
Official StatCounter Plugin Version 2.0.1
Slider Revolution Version 5.3.1.5
WP Reset Version 1.0
Yoast SEO Version 4.3
