I was in the exact same boat as all the previous posters, but I think I found the solution.
In the device manager, "Bluetooth Low Energy GATT compliant HID device" can now be found under the'Human Interface Devices' tab rather than 'Bluetooth'.
It has the power management option to turn off power saving, and so far my mouse has been running smoothly with no interruptions!
No idea what they felt the need to change it, but this should fix it for you!
Edit: Did not work as a permanent fix. The option below did, though!