Dynadock U3.0 - Ethernet Issues

My Dynadock had been working fine until yesterday, when my network connection started acting flaky.  Any website that uses HTTPS or any tools that use SSH will fail constantly.  As soon as I disabled the "dynadock Ethernet" LAN connection and switched to my wireless, everything works fine.
I tried disconnecting the Dynadock, deleting the drivers, and reinstalling but the problem still persists.

I have a similar problem.  New Dynadock U3.0 with a Satellite P750 laptop (i7 quad core, extra RAM).  When first powered on, everything works fine.  After some time - anything from a minute to maybe half an hour - the ext. monitor freezes.  Sometimes it recovers by itself, after both screens go black and flick on and off serveral times.  Often it does not recover and nothing I have tried will force it to recovery, other than unplugging the USB 3 cable between the laptop and the Dynadock then plugging it back in.  Drivers out of the box were 7.0 or 7.1.  Updated drivers to 7.4 (latest, with Win 8 support, although I am running Win 7), updated the BIOS, updated the monitor and display drivers.  Nothing changed.
I called Toshiba support and they said it must be a problem with the Dynadock, so they sent a new one.  I unistalled all drivers, installed 7.3 drivers from Toshiba website (latest version prior to adding Win 8 support), then connected the new Dynadock.  The problem is exactly the same.
This is totally unacceptable.  As a consulting engineer my laptop is my livelihood and I have spent more time trying to fix this thing than being productive.  Next step is a refund request and find some other solution.  Hoping for some assistance from this forum that might solve my problem.

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