1) Analyzed and cleaned my local copy of the website carefully, updated every single component, and got rid of not needed components.
2) Checked website security with webyfly.com which revealed two unnoticed security holes. I fixed everything afterwards.
3) Installed this component.
I'm not having any problems ever since. I don't know which of the three measures gave the best result (or maybe it's the combination of the three). However I'm quite happy with your component and will keep using it. Thanks.