Tvheadend

Hi,

i use tvheadend on a own server. I recently reinstalled to version 4.2.8. Since then I keep losing my channel assignments.
I use Kodi for my frontends and use Tvheadend's central channel sorting. Unfortunately I keep losing individual channels after e.g. a restart of my server. It looks like a new scan is simply overwriting my assignments (of tags and channel numbers) ...

How can I change this behavior?

Thanks in advance

i.a.K.

(I hope i posted my question in the right section