Having the random bluetooth mouse disconnect issue here as well. I've already unchecked the "allow turning off this device to save power" box in the device manager. It didn't fix the issue.
When the mouse works, it works great. No lags. Then randomly I'll lose the mouse, pointer stays on the screen where ever it was at the time the connection was lost, until the screen gets changed for whatever normal reason. Then the mouse pointer disappears.
The mouse worked just fine for three days when I first got it. Now I lose it anywhere from once an hour to 12 hours.
Bluetooth devices screen says the mouse is connected, but of course it doesn't actually work.
Removing the mouse and trying to add it again and re-pair does not work. It never discovers the mouse to offer a re-pair.
The Surface pen works just fine when this issue is happening, press the top button and One Note fires right up.
The only thing that gets the mouse back is a restart. Luckily this thing reboots quick. I'm having flashbacks of Windows 95 with all this rebooting, lol.
So from what I gather it appears the next step is either changing the bluetooth driver or seeing if I can change my router to 5GHz? It's a brand new 2.4GHz Linksys.