I had the the same problem. I think it's the SP bluetooth, hardware or software. Since a few weeks I use an external bluetooth dongle(disabled the internal BT), and no disconnects anymore.I really like my Sculpt Touch mouse: it's light, portable, and simple, which helps keep it clean. I do, however, have one complaint about it -- after a bit of use, it tends to disconnect from my SP. I then have to power the mouse down, wait 5-10 seconds, and then power it back up. Anyone else experience this? It can be quite annoying when it happens at the *wrong* time.