I just got the BT MightyMouse (I used to own one, but it was defective, so I returned it and got a MX Revolution. Now the MX just died on me, so I got a new BT MM). Every so often, the cursor lags and it's very slow. Sometimes, it doesn't register any movements/clicks at all. These problems seem to happen when the Mac wakes from sleep, or when I've been away from it for quite some time (without the Mac going to sleep). But the tricky thing is that it doesn't always happen after waking from sleep or being away from the Mac for a while. As long as I am working with the mouse/Mac continuously, there are no problems. When these problems happen, sometimes the mouse starts to work after moving around the cursor on my MacBook, and other times it requires a off/on cycle of the MightyMouse. Do any of you that own the BT MM have similar issues? I am just wondering because I have about 5 days left until I can exchange it. Although it's annoying, I think I can live with this "issue," since it doesn't go bezerk while I'm working on the Mac. But if it seems that I'm the only one having these problems, maybe I should exchange it for a new one... Please share your experience with me. MacBook C2D 2.16 10.4.10 Apple BT keyboard & Sony Ericsson W810i connected via BT in addition to the mouse.