Frozen Clock, loss of sound with Tascam US-122

I have been using my Tascam US-122 soundcard with my 1.25 gHz 15' Aluminum PowerBook with no problems for about the past year. I have it hooked up to the USB port on the right side of my computer, and it derives its power via USB (it is a USB 1.1 device). Suddenly, starting about a month ago (or so), I have noticed that the clock on the toolbar has been freezing sporadically, at which time I lose sound through the sound card. The SPD also appears when I move the cursor over the clock. After some investigation, I found that the clock returns to normal when I unplug the US-122 and the SPD disappears. But when I plug the US-122 back in, I get nothing (no power even). At this time, if I plug the US-122 into the other USB port, it works fine. In addittion, even when the US-122 won't work on the right port after being unplugged, I can plug in another USB device that will work just fine in that port. If I restart the computer, the US-122 will work again, but eventually the problem reoccurs. The problem seems to happen more often when the computer has been in sleep mode, but it is not consistently so.
I don't know if this problem has something to do with updates to OSX or with the US-122 or with the right USB port, which is also the USB 2.0 port. Is anybody else having similar problems? Can anybody help?
Thanks,
Will.

It turns out that I was wrong about one thing, once the USB port on the right side of my computer stops working for the US-122, it seems to shut down until I restart the computer. I thought that it worked after the US-122 went down and was unplugged because another device will receive power from the port when plugged in. It turns out that although the new device will power up, it won't be recognized by the computer. I appreciate any help or ideas. Thanks.
---Will.

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