Just been toiling with a problem affecting my SP2 and the Bluetooth mouse. Managed to fix it so thought I'd share my findings... Firstly my mouse would randomly disconnect when it wished and was generally slow. To fix this I went Control Panel > Device Manager > Bluetooth > Right-Click Marvell AVASTAR Bluetooth Radio Adapter > Properties > Power Management > Untick 'Allow the computer to turn off this device to save power'.



Secondly when downloading large files my mouse would become really jumpy (un-usable). What fixed this was going Control Panel > Device Manager > Network Adapters > Right-Click Marvell AVASTAR 350N Wireless Network Controller > Properties > Advance > Selective Suspend > Set value to 'Disable'.



I don't know how many others are having this issue but hey it worked for me. I'd imagine there may be some slight drop in battery life but for me that's not a huge issue.



Edit: Unfortunately it's this sort of thing that means that whilst I freaking love my SP2 I wouldn't recommend it to my friends. They have trouble right clicking never mind accessing Device Manager and to them this sort of thing could ruin a Surface.