My server is no longer crashing after I reinstalled the server. I saved the world and my addons. Then I reinstalled everything and made a new "server.properties" file, instead of adding the old one in.
I have made this about 3 days ago and I have no problems since now.
Backup your world (and addons when needed)
Delete all serverfiles
Install the BDS-Files
Make your setting in the new "server.properties" file
Upload your world (and addons)
Please keep in mind that you have to take the name of your world-file and copy it to the server.properties file. Where it says "level-name:Bedrock-Level" you have to delete "Bedrock-Level" and there you put your copied worldfile-name in.
Hopefully it works for you too....
I am not english, so I am sorry if my english is bad...
I have the same issue. It started about 3 days ago.
Server running on Linux Ubuntu 20.01, 8 Cores, 8Gb RAM, 10Gb SSD.
I have the same issue on Xbox an PC too...