Ssh sessions running top keep disconnecting

[bob prohaska]

For some reason, ssh sessions running top seem to be quitting
with
packet_write_wait: Connection to 50.1.20.25 port 22: Broken pipe

I'm in the habit of leaving an ssh session running top going on
machines running long jobs like world or port builds. On my Pi3
running 12.1-stable those sessions keep disconnecting. No other
ssh sessions, among the four open, seem to be affected.

The client is a Pi3b+ running raspberry pi os. It has a dozen
or so ssh sessions open, no others are affected.

Any ideas what might be going on?

Thanks for reading,

bob prohaska