I'm not saying this is the cause, because I do not recognize that error. However, two possibilities come to mind just based off the text of the error.
The first is that the documentation states that group replication/innodb clusters will fail if a transaction takes more than 5 seconds to transfer between nodes.
https://dev.mysql.com/doc/refman/5.7/en/group-replication-limitations.html
Look at > Very Large Transactions
Are you running large transaction and potentially hitting this limit? Just as an example, if you are loading a 50M transaction on a 10M Ether, you could hit this issue easily.
The second thing that comes to mind is a communications failure or interruption during the transmission of the transaction. "Unable to get Message" implies some type of communications error ... are you seeing any dropped packets? errors on the network interface? anything of that nature?