Autopost problems

Hi

it seems, that autopost is completly broken. Looking in the log I get lots of warnings like this:
[2018-07-24 09:03:12] – [**WARNING. Unhealthy Cron Request**] [ [More info] ] – Too close (1.66s) to the previous one. Now – 09:03:12 | Previous – 09:03:11| Cron called from 2a01:7e0:0:417:87::79c8 (WordPress/4.9.7; https://www.der-bank-blog.de)
But the cron is Setup and run correctly. And it is called only 4 times a hour, so the message “too Close” does not make any sense.

Please help

Cheers
Hansj?rg