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I hit the same problem with the following setup:

  • Lenovo ThinkPad 460s with Fedora 29
  • Lenovo ThinkPad Bluetooth Laser Mouse

I paired the mouse via _Bluetooth_ settings menu. Then I got "Connect/Disconnect every second" issue once the mouse or the laptop goes off/on.

My procedure to fix it was:

  1. Open _Terminal_
  2. bluetoothctl
  3. remove the mouse, if it is paired

    [bluetooth]# paired-devices
    Device 98:FD:B4:75:1B:39 ThinkPad Bluetooth Laser Mouse
    
    [bluetooth]# remove 98:FD:B4:75:1B:39
    [DEL] Device 98:FD:B4:75:1B:39 ThinkPad Bluetooth Laser Mouse
    Device has been removed
    
  4. turn on pairing on the mouse

    [bluetooth]# scan on
    Discovery started
    [NEW] Device 98:FD:B4:75:1B:39 ThinkPad Bluetooth Laser Mouse
    
    [bluetooth]# scan off
    Discovery stopped
    
  5. trust the device (the device is still in pairing mode)

    [bluetooth]# trust 98:FD:B4:75:1B:39
    [CHG] Device 98:FD:B4:75:1B:39 Trusted: yes
    Changing 98:FD:B4:75:1B:39 trust succeeded
    
  6. pair the device and connect

    [bluetooth]# pair 98:FD:B4:75:1B:39
    Attempting to pair with 98:FD:B4:75:1B:39
    [CHG] Device 98:FD:B4:75:1B:39 Connected: yes
    [CHG] Device 98:FD:B4:75:1B:39 Modalias: usb:v17EFp6038d0200
    [CHG] Device 98:FD:B4:75:1B:39 UUIDs: 00001000-0000-1000-8000-00805f9b34fb
    [CHG] Device 98:FD:B4:75:1B:39 UUIDs: 00001124-0000-1000-8000-00805f9b34fb
    [CHG] Device 98:FD:B4:75:1B:39 UUIDs: 00001200-0000-1000-8000-00805f9b34fb
    [CHG] Device 98:FD:B4:75:1B:39 ServicesResolved: yes
    [CHG] Device 98:FD:B4:75:1B:39 Paired: yes
    Pairing successful
    [CHG] Device 98:FD:B4:75:1B:39 ServicesResolved: no
    [CHG] Device 98:FD:B4:75:1B:39 Connected: no
    
    [bluetooth]# connect 98:FD:B4:75:1B:39
    Attempting to connect to 98:FD:B4:75:1B:39
    [CHG] Device 98:FD:B4:75:1B:39 Connected: yes
    Connection successful
    [CHG] Device 98:FD:B4:75:1B:39 ServicesResolved: yes
    [CHG] Device 98:FD:B4:75:1B:39 ServicesResolved: no
    [CHG] Device 98:FD:B4:75:1B:39 Connected: no
    [CHG] Device 98:FD:B4:75:1B:39 Class: 0x00000580
    [CHG] Device 98:FD:B4:75:1B:39 Icon: input-mouse
    [CHG] Device 98:FD:B4:75:1B:39 Connected: yes