Broadcom 2070 Bluetooth settings causes mouse to disconnect randomly

Here are the steps that solved my issue:

1. Open Device Manager
2. Go to Properties of your Bluetooth Device (in my case: Bluetooth -> Broadcom 2070 Bluetooth)
3. Switch to the Power Management Tab
4. Un-check "Allow the computer to turn off this device to save power"
5. Done

Note:

This can effect your mouse sleep mode and also your laptop's battery life when unplugged.