Phidgets DAQ1301_0 deattaching/reattaching

[arnevv]

I have a project where we use 6x Phidgets DAQ1301_0 to read out 84 buttons.
I connected a 12V 4.2A power supply to detect the inputs.
All 6x Phidgets DAQ1301_0 are connected to 1 VINT hub.
The VINT hub is connected with a powered usb hub.

When some of the buttons is pressed the Phidgets board deattached and reattached.

I cannot find the cause why this is happening.
Is there a limit of DAQ1301_0 that I can attach to 1 VINT hub ?
Or is there not enough USB power available ?

[mparadis]

Is it consistently the same buttons that cause the detaches? If there's a wiring issue that's causing a short from power to ground, it could cause a detach. As you said, it could also be a power issue. If you have a multimeter, you can take the VINT Hub out of its enclosure and measure the voltage between the USB power and USB ground. If it dips below 4 volts when the detach happens, it's almost certainly a power issue.

You can also enable logging, which will often provide a reason for the detach.

[Patrick]

Is the USB hub and the buttons powered by the same supply? Sounds like USB voltage is being browned out, but this should not happen since the DAQ1301 is isolated.

-Patrick

[arnevv]

I use now 2 VINT hubs connected to a PC.
I see no deattaching anymore.