I've tried switching all the available channels on my router... Didn't work.
But I don't think it's a matter of interference, because:
- If there are other devices downloading, transferring files over the network, but my surface network usage is low, the mouse behaves perfectly, even if I stay right in between the router and the other device.
- If I disable the built in bluetooth adapter and use a usb dongle, the mouse also stays perfect, even with heavy network usage...
I've been searching a little and it seems that the Surface pro has 2 antennas, one for 2.4ghz and is shared between Wifi and Bluetooth, the other is for 5ghz, and dedicated for wifi... I've seen people reporting similar issues with adapters from other vendors, that apparently were fixed with driver updates... I guess I'll have to wait until one becomes available, or just assume it never will be fixed XD