Ports stop working on Thunderbolt Docking Station

[Jiri Kanicky <j@ganomi.com>]

Hi.

I have Thunderbolt docking station and ports including USBs and HDMIs 
stop working intermittently.

Is there any way to find out if the issue is Thunderbolt connection 
related or if its the Docking shutting down the ports?

Thanks Jiri