Does listening port change on its own?

[dddkkk]

I apologize in advance for posting this question here but I posted it in "another" forum weeks ago and received no responses at all.

Im a Phex user and big fan (so it kind of applies) and I always get a great response from the Phex forum.

I had a host IP address in my list of favorites. I havent been able to connect recently and then came across that host in a keyword search today. I see that the listening port has changed from the 39000 block to the 42000 block. Ive noticed that a few of my favorite hosts have changed port numbers in the last few months. Im certain that they are the same hosts as previously and using the same IPs. I very much doubt that the users intentionally changed the listening ports.

Is there any reason that the listening port would change (in LW 4.14 and 4.12 in this case) on an existing installation, on its own, without the user intentionally changing it?

Thanks
Dave