MK, so the response from the reseller was that Autodesk's subscription center is goin' down from yesterday until the 25th, so I can't get it set up until the 26th to contact THAT tech support, but they offered their own version, which I think stumped the techie, because he ended up doing a search and I am reasonably sure he could only find the same sources that I did, as he told me nothing new and couldn't verify the claims and only offered more speculation.
His answer was that I may either need more RAM, or a faster HD, in case the HD wasn't handling the send/receives of info fast enough. He asked how many objects were in the files. In the file from the architect there are slightly over 15,000 objects when hitting a quick ctrl+a, and 598 objects in my model with only a couple dozen in my title block.
He says that any time you get more than 1,000 objects in a drawing, Autocad can start having poop fits like that.
I didn't feel to confident in trusting him... especially since I've had models FAR more complex than this and FAR more detailed and having FAR more xrefs in it, than this simple job, and Autocad had no problems. This is a simple building frame for an additional exterior stair tower. I've done whole fluid processing plants with numerous platforms of decent size, had the electrical, piping, mechanical, etc all modeled and xref'd into my structural model... and no problem. Including the 2D site plan and survey as a base for my model that I built up from, xref'd in. What he said did not make total sense.
Hopefully ADesk support can lend me a more helping hand once I'm able to get back with them.