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Pulseaudio outright stops audio via Bluetooth after sleep or prolonged period of time. Only restart fixes the issue. This started early 2016 in 15.10.
Issue is discussed here as well http://askubuntu.com/questions/763539/bluetooth-speaker-no-sound-in-ubuntu-16-04 and mentioned in other unrelated bugs.

Ubuntu Xenial 16.04 LTS

The log below:

May  1 17:18:07 jalexoidmobile pulseaudio[2884]: [pulseaudio] module-bluez5-device.c: Default profile not connected, selecting off profile
May  1 17:18:07 jalexoidmobile bluetoothd[7349]: /org/bluez/hci0/dev_00_02_3C_05_99_F2/fd4: fd(35) ready
May  1 17:18:07 jalexoidmobile rtkit-daemon[1794]: Supervising 3 threads of 1 processes of 1 users.
May  1 17:18:07 jalexoidmobile rtkit-daemon[1794]: Successfully made thread 10967 of process 2884 (n/a) owned by '1000' RT at priority 5.
May  1 17:18:07 jalexoidmobile rtkit-daemon[1794]: Supervising 4 threads of 1 processes of 1 users.
May  1 17:18:07 jalexoidmobile pulseaudio[2884]: [pulseaudio] bluez5-util.c: Transport TryAcquire() failed for transport /org/bluez/hci0/dev_00_02_3C_05_99_F2/fd4 (Operation Not Authorized)
May  1 17:18:07 jalexoidmobile kernel: [20583.032442] input: 00:02:3C:05:99:F2 as /devices/virtual/input/input24
May  1 17:18:19 jalexoidmobile pulseaudio[2884]: [pulseaudio] sink-input.c: Failed to create sink input: sink is suspended.


Bus 002 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 006: ID 04f2:b2da Chicony Electronics Co., Ltd thinkpad t430s camera
Bus 001 Device 008: ID 0a5c:21e6 Broadcom Corp. BCM20702 Bluetooth 4.0 [ThinkPad]
Bus 001 Device 004: ID 147e:2020 Upek TouchChip Fingerprint Coprocessor (WBF advanced mode)
Bus 001 Device 003: ID 17ef:1003 Lenovo Integrated Smart Card Reader
Bus 001 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

[20388.983474] IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready
[20389.070114] usb 1-1.4: New USB device found, idVendor=0a5c, idProduct=21e6
[20389.070120] usb 1-1.4: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[20389.070122] usb 1-1.4: Product: BCM20702A0
[20389.070124] usb 1-1.4: Manufacturer: Broadcom Corp
[20389.070126] usb 1-1.4: SerialNumber: 446D578686DD
[20389.076232] Bluetooth: hci0: BCM: chip id 63
[20389.092220] Bluetooth: hci0: BCM20702A
[20389.093225] Bluetooth: hci0: BCM20702A1 (001.002.014) build 0000
[20389.551476] wlan0: authenticate with a0:63:91:2f:3f:ed
[20389.554391] wlan0: send auth to a0:63:91:2f:3f:ed (try 1/3)
[20389.557790] wlan0: authenticated
[20389.558339] wlan0: associate with a0:63:91:2f:3f:ed (try 1/3)
[20389.562209] wlan0: RX AssocResp from a0:63:91:2f:3f:ed (capab=0x1411 status=0 aid=2)
[20389.581260] wlan0: associated
[20389.581369] IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready
[20389.830185] Bluetooth: hci0: BCM20702A1 (001.002.014) build 1669
[20389.846186] Bluetooth: hci0: Broadcom Bluetooth Device
[20418.269466] input: 00:02:3C:05:99:F2 as /devices/virtual/input/input23
[20583.032442] input: 00:02:3C:05:99:F2 as /devices/virtual/input/input24

** Affects: bluez (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: indicator-sound (Ubuntu)
     Importance: Undecided
         Status: Invalid

** Affects: pulseaudio (Ubuntu)
     Importance: Undecided
         Status: Confirmed


** Tags: xenial
-- 
Pulseaudio bluez5-util.c: TryAcquire() failed  - Operation Not Authorized
https://bugs.launchpad.net/bugs/1577197
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