@Sensei,
just a thought, do you have a buddy around that could come along with his computer to your place? Hook up, see whether Elite runs without the described issues. In the - in my opinon - unlikely event that everything runs smoothly on his, well, you can concentrate on your local HW & Connection. If this goes as I would assume, same problems occurring, it is useful information for FD Support, is it not?
As others said, so many parameters are involved, diagnosing is best performed by exclusion strategie. I know, pain in the butt, but I remember when I did music on keyboards, many keyboards, only an Atari hooked inbetween for sequencing, many external modules, drums etc. all in a network, and all of the sudden something refused to work, the only chance to eliminate errors was to take all units out of the network, reboot, and add one after the other to begin eliminating possible faulty hardware etc. and take it from there.
I think same applies here, I would start eliminating the possibility of error on your side first, then up date this information to FD.
Hope you get it sorted soon.