There is about a million possibilities of what could be causing this. In either case I doubt this is a problem with Aria, rather your computer is to blame. Things you could play around with would be:
1) Increasing the buffer length in your audio player (like foobar)
2) Unplugging other USB devices (such as external hard drives in particular)
3) Changing the PCI bus latency settings to increase the latency for USB (read this for example:
http://www.geocities.com/phileosopho...cilatency.html)
3) Another thought: my computer started producing click/pop sounds recently and apparently the problem was my computer overheating due to hot summer weather in Baltimore.
This is just of the top of my head...