This may well be the single most annoying problem I have ever experienced on a computer, ever. I dropped my Bluetooth Mighty Mouse from about 30cm onto a soft carpet, but it suddenly lost connection to the mac, and now, is causing me insane problems. If I place it on a surface and click it, to reactivate it, Mac OS X will recognise it, connect it and the mouse will function perfectly. However, if I lift the mouse even a milimetre of the surface, it will instantly die and OS X will greet my with a big fat "Connection Lost" sign. If it place it back on the surface, click it to reactivate it, wait a few seconds, it will resume working again. I assume this has something to do with connections inside the mouse, so that when I lift it, it breaks those connections and ceases to communicate with the mac. As it ceases to communite entirely, I assume then that the connection we are talking about is probably the power supply. Multiple battery replacements do nothing. I'm at my wits end. It's not particularly easy to draw vector art or play Tomb Raider Legends with a freaking trackpad. EDIT: I've also just deduced it's only when pressure is removed from the FRONT of the mouse, not at the back - so, toward where the sensor is, although by sliding it off the edge of a table and back I can tell that it's nothing to do with what the sensor is picking up itself. EDIT 2: Chrisr alive, I finally fixed it. Turns out the tiny piece of metal bent over to protrude against the latch inside the mouse that, when the battery cover is removed, turns it off, had been crushed just so slightly that it no longer held that latch down when the gravitational pull of the mouse against a surface wasnt helping it. I bent it outward slightly and now it works fine. I couldn't find a single mention of this happening anywhere online, so I'm assuming it's rare. Maybe it'll happen to someone else someday, and this thread will alleviate the mind-shattering annoyance that is to have your only mouse die on you.