"Sony VISCA over IP unable to connect to NDI sources with error Only one usage of each socket address"

According to the knowledge base, this error occurs when a checkbox is not checked while using NDI cameras. I'm getting the message whilst not using NDI cameras and with the checkbox checked. I can initially control the cameras, then I lose control and get this error when I disconnect and reconnect. Other PTZs (ptz optics protocols) continue to work but it does seem to take out all the sony protocol cameras.

The only fix is to restart Vmix. During a show, this is not a fix. I've had to do two shows on web controls only for these cameras.

Any ideas?