Also forgot to mention when I avoid the hub and run it through two seperate usb ports on my computer it acts the same way.

Its A Tendak 5 hub 3.0 with external power source of 60 amps supplying it.

hub

https://www.amazon.com/gp/product/B01C84M3SW/ref=oh_aui_detailpage_o01_s00?ie=UTF8&psc=1

power source

https://www.amazon.com/gp/product/B06XK3X3PW/ref=oh_aui_detailpage_o04_s00?ie=UTF8&psc=1

Help  

I tried to search for this problem. Hoping for an answer. always came up close, learned something new, but haven't fixed the issue. I have 2 2pac miners. both work great seperately, but together the last one plugged in would knock out the previous. Every time. I do have a power source of 60 amps at 5 volts.When I run a list of devices through cgminer they both pop up

Using seperate cgminer windows with specific "--usb 2:6" works fine on the one plugged in last. When I plug in the second one, it knocks out the first. cgminer list of device window does bring up one, Obviously error, Because being used. And the other one is there and ready. But Cgminer with specific "--usb2:6" shows no device available. But cgminer -n shows it there.

if i pull out the device that shows not there to reset it. It shows it there and now it will work, but the other will get knocked out and slowly go into zombie or off mode.

When I close the cgminer window it will show back up on the list (cgminer -n)

What is causing this issue.