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bluetooth mouse and keyboard stop working after some time

Hi,

I recently purchased bluetooth mouse and keyboard to use with a Debian
9 machine.  I could pair the devices without problems and they do work
for some time. However, after some time they stop working.  I suspect
that some timeout triggers. (After a reboot they start working again
for some time.)

I'm using kernel linux-image-4.19.0-0.bpo.6-amd6.

Below is an excerpt from /var/log/syslog showing that the Bluetooth
module is shutting down.

Any suggestions?

Nov 18 15:03:23 lupo NetworkManager[717]: <info>  [1574085803.9156]
device (wlp2s0): set-hw-addr: set MAC address to EA:9D:A4:E8:88:99
(scanning)
Nov 18 15:03:23 lupo kernel: [ 6888.646262] IPv6: ADDRCONF(NETDEV_UP):
wlp2s0: link is not ready
Nov 18 15:03:23 lupo NetworkManager[717]: <info>  [1574085803.9227]
device (wlp2s0): supplicant interface state: inactive -> disabled
Nov 18 15:03:23 lupo NetworkManager[717]: <info>  [1574085803.9463]
device (wlp2s0): supplicant interface state: disabled -> inactive
Nov 18 15:03:23 lupo wpa_supplicant[1140]: wlp2s0: Reject scan trigger
since one is already pending
Nov 18 15:05:44 lupo kernel: [ 7029.363271] usb 1-4: USB disconnect,
device number 3
Nov 18 15:05:44 lupo systemd[1]: Starting Load/Save RF Kill Switch Status...
Nov 18 15:05:44 lupo systemd[1]: bluetooth.target: Unit not needed
anymore. Stopping.
Nov 18 15:05:44 lupo systemd[1]: Stopped target Bluetooth.
Nov 18 15:05:44 lupo systemd[1]: Started Load/Save RF Kill Switch Status.
Nov 18 15:05:44 lupo /usr/lib/gdm3/gdm-x-session[1292]: (II)
config/udev: removing device MX Master 3 Keyboard
Nov 18 15:05:44 lupo /usr/lib/gdm3/gdm-x-session[1292]: (**) Option "fd" "50"
Nov 18 15:05:44 lupo /usr/lib/gdm3/gdm-x-session[1292]: (II)
UnloadModule: "libinput"
Nov 18 15:05:44 lupo /usr/lib/gdm3/gdm-x-session[1292]: (II)
systemd-logind: releasing fd for 13:85
Nov 18 15:05:44 lupo /usr/lib/gdm3/gdm-x-session[1292]: (II)
config/udev: removing device MX Master 3 Mouse
Nov 18 15:05:44 lupo /usr/lib/gdm3/gdm-x-session[1292]: (**) Option "fd" "51"
Nov 18 15:05:44 lupo /usr/lib/gdm3/gdm-x-session[1292]: (II)
UnloadModule: "libinput"
Nov 18 15:05:44 lupo /usr/lib/gdm3/gdm-x-session[1292]: (II)
systemd-logind: releasing fd for 13:86
Nov 18 15:05:44 lupo /usr/lib/gdm3/gdm-x-session[1292]: (II)
config/udev: removing device MX Keys Keyboard
Nov 18 15:05:44 lupo /usr/lib/gdm3/gdm-x-session[1292]: (**) Option "fd" "54"

Thanks,
Fede
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