[All Series, Realtek ALC887-VD, SPDIF Out, Internal] fails after a while

[pwp]

Using text to speech on the command line (Cepstral, Swift) I get error "shm_unlink(/pulse-shm-2584180510) failed: No such file or directory"

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: alsa-base 1.0.25+dfsg-0ubuntu5
ProcVersionSignature: Ubuntu 4.4.0-36.55-generic 4.4.16
Uname: Linux 4.4.0-36-generic x86_64
NonfreeKernelModules: nvidia_uvm nvidia_modeset nvidia
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC2: pw 4713 F.... pulseaudio
 /dev/snd/controlC1: pw 4713 F.... pulseaudio
 /dev/snd/pcmC0D0p: pw 4713 F...m pulseaudio
 /dev/snd/controlC0: pw 4713 F.... pulseaudio
CurrentDesktop: Unity
Date: Wed Sep 14 09:14:20 2016
InstallationDate: Installed on 2014-09-05 (739 days ago)
InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
PackageArchitecture: all
SourcePackage: alsa-driver
Symptom: audio
Symptom_Card: Built-in Audio - HDA Intel PCH
Symptom_Jack: SPDIF Out, Internal
Symptom_Type: Sound works for a while, then breaks
Title: [All Series, Realtek ALC887-VD, SPDIF Out, Internal] fails after a while
UpgradeStatus: Upgraded to xenial on 2016-08-05 (39 days ago)
dmi.bios.date: 04/18/2013
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 0311
dmi.board.asset.tag: To be filled by O.E.M.
dmi.board.name: Z87M-PLUS
dmi.board.vendor: ASUSTeK COMPUTER INC.
dmi.board.version: Rev X.0x
dmi.chassis.asset.tag: Asset-1234567890
dmi.chassis.type: 3
dmi.chassis.vendor: Chassis Manufacture
dmi.chassis.version: Chassis Version
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr0311:bd04/18/2013:svnASUS:pnAllSeries:pvrSystemVersion:rvnASUSTeKCOMPUTERINC.:rnZ87M-PLUS:rvrRevX.0x:cvnChassisManufacture:ct3:cvrChassisVersion:
dmi.product.name: All Series
dmi.product.version: System Version
dmi.sys.vendor: ASUS
mtime.conffile..etc.modprobe.d.alsa-base.conf: 2015-05-15T19:10:48.857490