Problem connection DA14580DEVKT-P_VC (14580 Pro kit) to PC

I got a new DA14580DEVKT-P_VC (14580 Pro kit) and I have installed all the necessary software and drivers mentioned in "UM-B-049 DA1458x Getting started with Development Kit - Pro_v1.1.pdf"

I have been able to run the blinky sample program and when the connection happens there is no problem using the board

However, if I detach the USB cable and connect it again, sometimes it takes a long amount of time to get detected in the PC

If I look at the Windows Device Manager when I connect the USB cable, normally it should show two new USB serial ports after a successful connection, but most of the time the Device Manager window just keeps refreshing itself, and does not show the new USB serial ports

The red light next to the Atmel chip ATSAM3U2C (this is the section of the mother board with the segger debugger I think) keeps blinking rapidly, and the green light next to the USB port periodically turns on, but it has a hard time getting detected by the PC

During this time, if I open Keil IDE, click "options for target" -> Debug -> Use: J-LINK/J-TRACE Cortex -> Settings, The SW Device panel shows that J-Link debugger could not be detected

Once the PC detects the motherboard, it works fine, but my problem is that it takes a long time for the PC to detect the motherboard

Sometimes it just works, and sometimes I need to detach and reattach the USB a number of times before the development kit is detected by the PC

How can I fix this?

PC: Windows 7 Enteprise Service Pack 1, 32 bit
SDK: 5.0.4
Keil version: uVision V5.24.2.0
Hardware: DA14580DEVKT-P_VC (14580 Pro motherboard) and DA14580ATDB and DA14580UNDB-P daughterboards

Thank you