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Frustration over 7990 'Quadfire' connection online!

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.Hi all, I need some expert advice regarding momentarily intermittent USB device controller (G27) disconnection, with only one application (grid autosport), and whilst that application is using both the controller and the internet simultaneously. I  reinstalled the application and wiped and reinstalled windows several times. I also uninstalled similar apps in case of any confliction and uninstalled and reinstalled every hardware driver and made sure they were up to date whilst trying older and beta drivers. I also flashed and updated the BIOS etc and disabled legacy. This was days of faffing and fiddling until I eventually discovered (by sheer fluke) my GPU drivers had not installed correctly the last time and were running the application with only one out of four GPUs (7990's in crossfire, or 'quadfire' as it has been coined). Yet I had disabled crossfire previously, before the very first reinstall of all apps, driver's and windows to check and see if this were causing the issue, but with no joy. So I removed one of the two 7990's and all now works well again with no controller disconnection issues at all whilst in the app and online. I've written Logitech and codemasters regarding the issue with no response. Usually I'd not care why and be satisfied it works. Nowadays I find myself quite intrigued as to why, in stead of winging it. i.e, I want to learn more than I currently know. Also, why should I remove expensive hardware due to an annoying problem whilst also sacrifice quality and performance. It had occurred to me an IRQ request was in confliction, but both pci-e and USB are not using the same IRQ address/protocol. Could it be the motherboard (MSI gd65 z87) and or the processor (4.2Ghz 4770k) bottlenecking or some sort of latency fluctuation caused by bad programing by codemasters, Logitech, Amd etc, or all of the above? It cant be a power issue with a 1250w. All apps that use the same hardware never have this problem, even ones in a pre-alpha state like Assetto Cora. Should I upgrade my motherboard and CPU to say, Asus deluxe X79 and i7 4930 or is this just something that I should overlook? I'm not one to sweep such things under the rug lately due cost, interest, and not whilst I'm building an identical rig for my soon to be 15 year old sons birthday. I'm sure it would be very disappointing for him.
Any thoughts would be greatly appreciated.
MSI GD65 Z87, i7 4770k @4.2Ghz, 2x XFX DDD 7990's in 'Quadfire', 16Gb Vengeance Pro @2133Mhz, OCZ ZX 1250w, 60Gb Corsair SSD, 1Tb WD HDD @7,200rpm, 2x 4Tb WD HDD @7,200rpm, Windows 8.1 64bit, Aero Cool X-Predator Evil Green Edition, 13x assorted fans.

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