Am I causing Touch In / Out DATs ports to stay in use on close?

I’ve just started using multiple instances, and am using Touch In/Out DATs to send data back and forth between the two instances of Touch.

Sometimes, when I start the instances up, I find that at least one of the Touch In/Out pairs has stopped working, and it resumes working immediately when I change them to a different port.

Is there something I’m inadvertently doing which is causing the ports to stay in use on close? I did a search but found nothing in the last year or so, so I thought I’d ask again, in case there are best practices for version 2021.

Just bumping this. Anyone know anything about Touch In and Touch Out OPs needing to change ports after restarting TouchDesigner?