Paul,
Quick update: I was unable to use a Windows version as the Melco was stubbornly refusing to be visible to a Windows machine. Call in to Melco, appreciate not your issue.
However, when I reverted to the Mac version I have now been able to process 99% of the library in ever increasing batch sizes. One I think took almost 75 minutes to process. I did not, through all this process (~6700 tracks) have a single issue of the loss of network connection.
There was, however, one particularly stubborn album: Coltrane Plays the Blues which continues to hang and cause the process to fail. I haven’t, as yet, isolated whether it is a specific track that causes the problem. Nor have a re-ripped the album to establish whether it was a bad rip.
I will report back when I have. Only sharing with you in case other people have similar issues in the future.