Hi Michael,
It could be a good idea to wonder what you are doing "wrong". Why ? because there is nothing wrong with Unattended or anything. What surely *is* wrong, is that you always play Attended. XXHighEnd is not really made for that, and to name something, it could relate to losing a Network connection, depending on further settings (hard to work out for me).
It seems that you foremost must investigate why you lose your connection with Unattended.
(I hope I understood that correctly)
We must both realize that by now you changed all the "procedures" possible, probably because somewhere
one small thing is applied wrongly. What this is, is hard to tell.
I have also nice news for you :
If you play Attendedly,, you will literally "burn" your Mach III because it runs too hot in that mode when continuously At this time done. I don't recall whether you have sudden shut downs (music stops playing) but if so, you can bet the system shuts down because it runs out of juice (this can be because of the heat).
Your Network won't work out of the box with the fresh copy because it is not fresh at all (yes, I am repeating myself). That copy was not made from your OS or else it would have been as large to begin with. It is a general copy for a general OS and everybody receives that copy (counts for each of the OSes in there). But I think you understood that. Only please grasp the relation with the network settings.
I have sent you a procedure to "expand" the small OS file. I hope that is OK for you (and that it is better than sending you something). Your network still won't work - that is up to you (but set that up in Normal OS - The Troubleshooter will normally let it work). And in case you did not expect it ... your drive mappings also must be made again.
I hope this helps ?
Peter