hi torsten,
I have the same problem with my jeelink. a question, how do you restart the jeelink or the binding? In FHEM you can use the following command: attr Jeelink timeout 120,30 (meaning that after 120 seconds no data, a reset is performed, check every 30 seconds), but how does that work in OH?
I also found the following post, but unfortunately there was no answer:
https://community.openhab.org/t/new-jeelink-openhab2-binding/15018/191
Thank you for your help!