I bought a Cube in April and it runs great but occasionally it loses connection to the web browser app. Everything else works fine and I can see from the Dash pool I use that it is still generating hash. The Cube has a fixed IP on my home LAN.  The only way I can regain web access is to recycle the power switch on the device. It may stay connected fine for a few days and then lose web access with no apparent reason. Anyone else with a Cube ever see this happen?

http://sapphirenitro.sapphiretech.com/en/580-LE.html

MSI Z170A GAMING PRO CARBON 7GPU
4 Nitro+ RX 470, 3 on 1x16 risers, 1 on MB
Windows 10 Home, UEFI install mode, 120 GB SSD
BIOS, Settings -> Advanced -> PCI Subsystem Settings
Change ‘PEG0’ and ‘PEG1’ values to ‘Gen1’
Set ‘Above 4G Decoding’ to ‘Enabled’

All works fine including mining but when I add the 5th GPU on a 1x16 riser it doesn't start, no fans startup as is normal for any recognized GPU. I tried other risers and another PCIe slot with the same results. I even replaced the GPU because I thought it might be defective but I continue to get the same results.

Any other ideas what could be going wrong here?