The only reference I can find to this message is in Discord.
Might be caused by farmer being too slow to sign a reward for some reason or disconnecting from NATS if in the cluster
It sounds like you may be approaching the limit of the hardware. Can you explain a bit more about the server spec please? How many farms is that 500TB spread across? How do you have the cluster spread out (which components are on shared boxes). Help us build up a picture of your cluster topology and resource usage. Thanks.