USB3 malfunctions with AsRock mobo

Hey!

I bought this computer a few years back for photo editing. One of the primary features that I wanted was USB3 support because I often have to unload my camera's huge memory cards on my PC. I bought a cheap AsRock motherboard with USB3 support and a Transcend USB3 card reader.

The problem is that the USB3 transfers rarely work. Just today I was trying to transfer files from the memory card but the transfer froze right at the beginning and the speed showed up as ~200 bytes/second. I tried to cancel the transfer but eventually had to reboot the computer because it just didn't stop.

I then wen't ahead and uninstalled AsRock XFast USB to see if it was the cause of the problems. This time the transfer kind of worked but only with speeds varying from 4 to 12 MB/s. The transfer also froze every now and then and then continued as if nothing had happened.

After that I switched the card reader to a USB2 port and all the files were transferred quickly with a speed of 20-30 MB/s without freezes.

I have made sure that my drivers and XFast are up to date. Often the problem goes away if I re-install them both but soon the same problems start again. Does anyone know what could be the source of the problem here? I'm a little disappointed with AsRock as I bought this specific mobo just because of its USB3 capabilities.

Setup:

AsRock B75M-GL
Intel i7 2600S
Kingston 8GB 1333MHz DDR3
450W PSU
Windows 7 x64