Cardano-cli: MuxIOException Network.Socket.recvBuf: resource vanished

I have a workstation setup as a relay - it has 16GB of ram - this machine just checks a cli wallet for a balance a few times a minute it has no public services exposed except for the role of Cardano-node relay. I submit hundreds of transactions a day using the cli on this pc, since upgrading to 1.29 I am getting this multiple times a day.

MuxError (MuxIOException writev: resource vanished (Broken pipe)) “(sendAll errored)”
cardano-cli: MuxIOException Network.Socket.recvBuf: resource vanished

I operate a public mint tool for NFTs and we have been operating since April. Any insight into what is going wrong - normally when a resource is vanished it’s due to lack of free mem? I have more than 4GB of ram available (free).