I have the same problem with easytether lite. I'm using Ubuntu, and I have HTC Evo G4. I have no other network connections on. i have Sprint as carrier. I have usb 2.0 for sure on computer. My screen is set to never never shutoff,so I have to hit power button to make screen sleep. I have excellent speeds when I update computer or surf, watch youtube, but when I try to download the occasional pirated file trough torrent, I get problems. The torrent speeds go up for a minute of two to normal fast speed, then the gradually work their way down. I found the a quick way and a long way to reset things. The long way: I have to kill the easytether app. unplug the usb. hit cnrl c to stop the terminal easythether app (the one on the computer). Then I just restart everything. The fast way is two steps. Just can't remember now. If I find out what is doing it, I'll leave the answer also. I've had this probem with some fire sharing programs on Linux at cafes. I switch torrent programs and the problem goes away, sometimes. I'm wondering if this is not a throttling issue by the carrier.