U-Mix Control Pro 2 looses usb power when in use ? :(

Hello everyone I have a strange problem with my U-Mix Control Pro 2 MIDI mixer.
when I switch the controler on. The power led suddenly turns off after about 20 seconds. It used to work great on USB power before. I thought it was a USB cable issue and bought a new cable but the same thing happens when I power the controler on.
The power led stays lit for about 20 seconds then it looses power. flicking the power switch on the back dosent work unless i restart the laptop again. I also tried a few other laptops to make sure it wasnt my laptop causing the problem but the same thing kept happening
sorry for the long post and thank you all in advance for all the help
when I switch the controler on. The power led suddenly turns off after about 20 seconds. It used to work great on USB power before. I thought it was a USB cable issue and bought a new cable but the same thing happens when I power the controler on.
The power led stays lit for about 20 seconds then it looses power. flicking the power switch on the back dosent work unless i restart the laptop again. I also tried a few other laptops to make sure it wasnt my laptop causing the problem but the same thing kept happening

sorry for the long post and thank you all in advance for all the help
