[DDuck007]

... After testing 2 days it did not crash with #1221b ...

Not yet clear if this is a Kodi or mesa-18.3.1 issue, this will require further investigation by a Kodi developer, at some point.  

ok, Thank you - i will stay at version #1221b (or #1211) for now, as you suggested.
(running without my "advancedsettings.xml" leads to problems with streaming services due to not so good internet connection)