"disconnected from WebSocket" are crashing my server? 10$ Reward

Guys,

Im having a problem im my network that my server was crashing with TPS 19.5+ and more then 100 players online.
Well, a second before he crashs the logs give a error, saying "[JDA MainWS-WriteThread/WARN]: Got disconnected from WebSocket (Internet?!)...", and after this, all my players get kicked from the server.

Pastebin of the error: https://pastebin.com/FxkTktmX

Anyone know what is "WebSocket" or why he is going down my server?
The strange thing is: I have a dedicated machine 64gb i7 6600k, in this machine i have two servers, this server that was crashing and other server that have 100 or less players that DONT CRASH in ANY OCASION, wtf??

If you can help me ill pay you 10$.
Thanks for all.