Dr. Sb. no idea regarding it, however, let me share my experience regarding ZONG USB device for Wifi:
Sometimes, ZONG works Great, but sometimes, bilkul hi reh jata hai. Then there is another phenomena, jo aaj takk mujhay to samajh nai aya (may be, someone can help me on it):
Let's say, device is connected and generating Wifi signals are best speed. After few days / weeks, speeds will reduce. Then I'll need to change its orientation, like if it was at 0 degree / pure horizontal, then I'll have to rotate it at 90 degree, upside down at 180 degree, or at 270 degree, then it'll start working fine again.
Sometimes, all failed, and I had to change the position of device altogether. Then after some days / weeks, it'll also fail, and I'll have to place it somewhere else, like in other room.
And iss tarha kartay kartay, harr jagha sey ghuum phir k, device phir apni asli jagha p aa jati hai, and works fine again...