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Bluetooth devices get disconnected.

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Hi.

I am running Debian Sid with KDE. I have Logitech MX 2 and Bose 
Bluetooth headphones. I experience disconnects very often.

I tried to use different configuration, but nothing seems to work.

After running the following the mouse gets connected again, and I can 
reconnect BT headphones also. However the devices get disconnected again 
in 1, 5 or 10 minutes again:
hciconfig hci0 sspmode 1
hciconfig hci0 down
hciconfig hci0 up

I also noticed that when the mouse is working I see the following:

$ hciconfig -a
hci0:   Type: Primary  Bus: USB
         BD Address: 28:16:AD:B6:2A:0A  ACL MTU: 1021:4  SCO MTU: 96:6
         UP RUNNING
         RX bytes:21923293 acl:792631 sco:0 events:111597 errors:0
         TX bytes:10619740 acl:18458 sco:0 commands:1832 errors:0
         Features: 0xbf 0xfe 0x0f 0xfe 0xdb 0xff 0x7b 0x87
         Packet type: DM1 DM3 DM5 DH1 DH3 DH5 HV1 HV2 HV3
         Link policy: RSWITCH SNIFF
         Link mode: SLAVE ACCEPT
         Name: 'supermanbt'
         Class: 0x1c010c
         Service Classes: Rendering, Capturing, Object Transfer
         Device Class: Computer, Laptop
         HCI Version: 4.2 (0x8)  Revision: 0x100
         LMP Version: 4.2 (0x8)  Subversion: 0x100
         Manufacturer: Intel Corp. (2)


After disconnect I can see the following:

$ hciconfig -a
hci0:   Type: Primary  Bus: USB
         BD Address: 28:16:AD:B6:2A:0A  ACL MTU: 1021:4  SCO MTU: 96:6
         UP RUNNING PSCAN
         RX bytes:22096318 acl:800070 sco:0 events:113012 errors:0
         TX bytes:11042199 acl:19322 sco:0 commands:2053 errors:0
         Features: 0xbf 0xfe 0x0f 0xfe 0xdb 0xff 0x7b 0x87
         Packet type: DM1 DM3 DM5 DH1 DH3 DH5 HV1 HV2 HV3
         Link policy: RSWITCH SNIFF
         Link mode: SLAVE ACCEPT
         Name: 'Bluemoon Universal Bluetooth Host Controller'
         Class: 0x000000
         Service Classes: Unspecified
         Device Class: Miscellaneous,
         HCI Version: 4.2 (0x8)  Revision: 0x100
         LMP Version: 4.2 (0x8)  Subversion: 0x100
         Manufacturer: Intel Corp. (2)

I also configured blutoothd with -d option, but I don't see any specific 
messages when the devices disconnect.

Any thoughts how to fix it or debug it? Is this general bluetooth issue 
or KDE bluedevil problem?

Thanks Jiri

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Bluetooth devices get disconnected. Jiri Kanicky <j@ganomi.com> - 2017-12-12 14:00 +0100
  Re: Bluetooth devices get disconnected. Jiri Kanicky <j@ganomi.com> - 2018-01-17 00:30 +0100

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