While using the mouse with a Windows 7 computer I noticed that when left idle for a long period of time, the mouse seems to go into some sort of suspend mode. When you attempt to move the mouse while it's like this, it doesn't respond for some time, but soon becomes responsive again. I suspect that this is where the issue is occuring under Ubuntu; the mouse has gone into some low-power mode just like under Windows, but doesn't resume correctly under Ubuntu as it does under Windows.
While using the mouse with a Windows 7 computer I noticed that when left idle for a long period of time, the mouse seems to go into some sort of suspend mode. When you attempt to move the mouse while it's like this, it doesn't respond for some time, but soon becomes responsive again. I suspect that this is where the issue is occuring under Ubuntu; the mouse has gone into some low-power mode just like under Windows, but doesn't resume correctly under Ubuntu as it does under Windows.