I had the problem with all 3 of my Bluetooth mice on the Surface Pro. It's like the Bluetooth connection has been dropped. Most of the time if I wiggle and click the mouse a few times it will come back. Other times I have had to wait sometime to get the connection back. It is really annoying. I Google it and found a way to solve this problem: Briefly, do these steps can solve the problem: First, Make sure that the Bluetooth service is started 1.Press the "Window icon" + "R" on the key board, Type "services.msc", and press "OK" 2. Double-click the Bluetooth Support Service. 3. If the Bluetooth Support service is stopped, click Start. 4. On the Startup type list, click Automatic. 5. Click the Log On tab. 6. Click "Local System account". 7. Click OK. 8. If you prompted to restart the computer, click Yes. Then, Bluetooth Power Management Setting: 1. open up Device Manager, expanded “Bluetooth”, and double-clicked on the "Marvell AVASTAR Bluetooth Radio Adapter". 2. Go to the Power Management Tab and clear the checkbox “Allow the computer to turn off this device to save power”. And finally, No more disconnects.