Paper UI after restart empty thing list

Hello everyone,

in the last week i had problems with my network. Regarding to this problem I had restarted my raspberry pi with openhab2. After restart got the openhab-server no connection to the internet, ccu2 and other things.
the Classic ui and Paper could be opene. After a few minutes I saw, that inside the Paper ui the list of things was empty. all my components are missing. They are also not in the inbox.
I found no problems and errors. so I rebuild the raspberry with my last image-Backup. after that it was running directly fine. Today, I had to restart the raspberry again. the result is, that the Things-list is empty again.
Can some give me a feedback, what is wrong and how can I resolve the problem?