OrientDB 3.1.5 Odd TCP disconnection messages

[CommuniG8]

Hi first post here!

I'm testing out OrientDB 3.1.5 over a three Server distributed configuration and I keep seeing an odd TCP Disconnect in the log every 30 seconds. I say "odd" because its localhost to localhost and referencing the Hazelcast port. . Anybody know what might be causing this?

2020-12-10 17:39:22:894 INFO [1-orientdb]:2434 [orientdb-prod] [3.12.8] Connection[id=57, /127.0.0.1:2434->/127.0.0.1:42218, qualifier=null, endpoint=null, alive=false, type=NONE] closed. Reason: Connection closed by the other side [TcpIpConnection]

[CommuniG8]

I have also tried v3.0.0 and 2.2.35 and get the same issue.
However, rebuilding the Ubuntu 20.04 LTS AWS Servers with the latest Ubuntu updates applied has fixed it.
So it looks as if the last Server build introduced a Kernel/TCP Stack bug that was recently fixed.