Here are the log files in .cache/upstart as suggested. Which ones are relevant to this issue? I'll upload them to pastebin

address-book-service.log.1.gz
address-book-service.log.2.gz
address-book-updater.log.1.gz
address-book-updater.log.2.gz
application-click-com.ubuntu.terminal_terminal_0.9.0.log
application-click-com.ubuntu.terminal_terminal_0.9.0.log.1.gz
application-click-logviewer.neothethird_logviewer_2.1.log
application-failed.log.1.gz
bluez-mpris-proxy.log.1.gz
bluez-mpris-proxy.log.2.gz
ciborium.log.1.gz
ciborium.log.2.gz
click-user-hooks.log.1.gz
click-user-hooks.log.2.gz
dbus.log
dbus.log.1.gz
dbus.log.2.gz
dbus.log.3.gz
dekkod-notify.log
dekkod-notify.log.1.gz
dekkod-notify.log.2.gz
gnome-keyring.log.1.gz
gnome-keyring.log.2.gz
indicator-datetime.log.1.gz
indicator-datetime.log.2.gz
indicator-keyboard.log.1.gz
indicator-keyboard.log.2.gz
indicator-network.log
indicator-network.log.1.gz
indicator-network.log.2.gz
indicator-network.log.3.gz
indicator-network-secret-agent.log.1.gz
indicator-sound.log
maliit-server.log.1.gz
maliit-server.log.2.gz
maliit-server.log.3.gz
media-hub.log
media-hub.log.1.gz
media-hub.log.2.gz
media-hub.log.3.gz
mediascanner-2.0.log.1.gz
mediascanner-2.0.log.2.gz
mediascanner-2.0.log.3.gz
msyncd.log
msyncd.log.1.gz
msyncd.log.2.gz
msyncd.log.3.gz
mtp-server.log.1.gz
mtp-server.log.2.gz
nuntium.log
nuntium.log.1.gz
nuntium.log.2.gz
nuntium.log.3.gz
ofono-setup.log.1.gz
ofono-setup.log.2.gz
pulseaudio-trust-stored.log.1.gz
pulseaudio-trust-stored.log.2.gz
scope-registry.log
scope-registry.log.1.gz
scope-registry.log.2.gz
scope-registry.log.3.gz
session-migration.log.1.gz
ssh-agent.log.1.gz
ssh-agent.log.2.gz
sync-monitor.log
sync-monitor.log.1.gz
sync-monitor.log.2.gz
sync-monitor.log.3.gz
telephony-service-indicator.log
telephony-service-indicator.log.1.gz
telephony-service-indicator.log.2.gz
tone-generator.log
tone-generator.log.1.gz
tone-generator.log.2.gz
ubuntu-location-service-trust-stored.log.1.gz
ubuntu-location-service-trust-stored.log.2.gz
ubuntu-push-client.log
ubuntu-push-client.log.1.gz
ubuntu-push-client.log.2.gz
ubuntu-push-client.log.3.gz
unity8-dash.log
unity8-dash.log.1.gz
unity8-dash.log.2.gz
unity8-dash.log.3.gz
unity8.log
unity8.log.1.gz
unity8.log.2.gz
unity8.log.3.gz
untrusted-helper-type-end-push-helper.log.1.gz
url-dispatcher.log
usensord.log.1.gz
usensord.log.2.gz

Here is /var/log/syslog https://www.dropbox.com/s/ug0632bcv34hepr/syslog.crash?dl=0
I will leave this file shared for as long as possible.