My friends and me have our server now for over 4month and I never saw a "Crash" or Error like this before. Since the 1.14 is released and the server got updated was it a bit laggy. After 2 days came the first Error, it was the same like this one. I had to do a complete Chunkfix of the Map and with this every entity got deleted, for one-time it's okay but now the problem got back. 

The server begin to lag harder an then you get kicked with the reason of an "Time Out". You can't login again and the server connection in the server list is lost. The console writes every second the lines that are in the picture. Does someone know how to fix it? The server is complete vanilla, no plugins and no mods.