Export doesn't start when syncing is unpaused

I am first going to describe my problem is as few words but as much detail as possible 🙂 I will then comment or update to include whatever system info might be helpful to help you help me. Thank. you in advance for your help/time. 

Several months ago I started having issues exporting out of Lightroom Classic. I would start the export of jpg files and it would act like it was starting but never actually do anything. Then I started having issues importing as well. I have been using the same catalog which has 600,000+ images, all sync'd with the cloud. 

Long story short, after several support calls trying all the usual fixes, the only thing that seems to work is to create a new catalog and NOT sync it with my existing cloud files. As soon as I do that, my problems creep into the new catalog as well. Not right away but as the numbers of sync'd images grows, so do my problems. 

One helpful Adobe support person told me to pause my sync, whcih actually DOES work to allow other Lightroom functions to happen properly but as soon as I start sync, I bascially have to stop it, restart my machine and then do other things before starting again. 

Add to that the fact that my sync with the cloud never seems to end. I get that with as many images as I have, it takes time but it has been running for weeks. 

I just need to get back to where my active work sync's across all lightroom products so I can use my workflow again. 

Help? 

Generally speaking... I am on the latest version of lightroom (updated maybe 2 weeks ago), a fairly powerful PC with a decent video card. Again, I will provide full specs/logs if necessary.