On Wed, Jun 26, 2019 at 06:02:03PM +0200, Robert Vollmert wrote:
> It’s with arpnetworks.com, their default “small" VPS. I don’t
> really know more; here’s some dmesg output that might be relevant,
> happy to provide more info.

Okay, I've asked them about it on IRC:

http://irclogger.arpnetworks.com/irclogger_log/arpnetworks?date=2019-06-27,Thu

Let's wait and see what they think about the issue.