Cannot connect to Linux workspace

Hi,
I'm having a problem with my Linux workspace. It no longer accepts connections from the Workspace client.
Seems to be the error

LAUNCHER :reapChild: Child process 9609 for desktop session died with signal 'Hangup'

Bigger section of the log below.
I've contacted Amazon Support about it but no joy so far, I'm hoping someone in the community has come across this before and knows how to fix it.
I can ssh to the box with no problem and apart from the error all seems to be fine.

Thanks
David

2019-10-30T14:19:48.840Z 00000000-0000-0000-0000-000000000000 > LVL:2 RC:   0          COMMON :local time 2019-10-30T14:19:48.840+00:00
2019-10-30T14:19:48.840Z 00000000-0000-0000-0000-000000000000 > LVL:2 RC:   0          COMMON :-- unknown_app begins.
2019-10-30T14:19:48.840Z 00000000-0000-0000-0000-000000000000 > LVL:2 RC:   0          COMMON :--------------------------
2019-10-30T14:19:48.840Z 00000000-0000-0000-0000-000000000000 > LVL:2 RC:   0          COMMON :**** System Info
2019-10-30T14:19:48.840Z 00000000-0000-0000-0000-000000000000 > LVL:2 RC:   0          COMMON :Linux 4.14.146-120.181.amzn2.x86_64 (Generic)
2019-10-30T14:19:48.840Z 00000000-0000-0000-0000-000000000000 > LVL:2 RC:   0          COMMON :4 processors detected
2019-10-30T14:19:48.840Z 00000000-0000-0000-0000-000000000000 > LVL:2 RC:   0          COMMON :15744MB/16039MB of physical memory available
2019-10-30T14:19:48.840Z 00000000-0000-0000-0000-000000000000 > LVL:2 RC:   0          COMMON :****
2019-10-30T14:19:48.840Z 00000000-0000-0000-0000-000000000000 > LVL:2 RC:   0          COMMON :FOLDER_TEMP               = '/tmp/teradici-pcoip/'
2019-10-30T14:19:48.840Z 00000000-0000-0000-0000-000000000000 > LVL:2 RC:   0          COMMON :FOLDER_PROGRAM_DATA       = '/etc/pcoip-agent/'
2019-10-30T14:19:48.840Z 00000000-0000-0000-0000-000000000000 > LVL:2 RC:   0          COMMON :Process ID = 9226
2019-10-30T14:19:48.840Z 00000000-0000-0000-0000-000000000000 > LVL:2 RC:   0        LAUNCHER :run: starting session launcher
2019-10-30T14:30:21.258Z ce87e14b-2759-486f-8ff4-7a82c7e07cc7 > LVL:1 RC:   0        LAUNCHER :launchXorg: launching Xorg
2019-10-30T14:30:21.556Z ce87e14b-2759-486f-8ff4-7a82c7e07cc7 > LVL:2 RC:   0        LAUNCHER :Xorg pid = 9601
2019-10-30T14:30:21.557Z ce87e14b-2759-486f-8ff4-7a82c7e07cc7 > LVL:1 RC:   0        LAUNCHER :launchDesktop: launching mate desktop
2019-10-30T14:30:21.586Z ce87e14b-2759-486f-8ff4-7a82c7e07cc7 > LVL:2 RC:   0        LAUNCHER :waitForDesktop: desktop signalled PAM session is ready
2019-10-30T14:30:21.587Z ce87e14b-2759-486f-8ff4-7a82c7e07cc7 > LVL:2 RC:   0        LAUNCHER :desktop pid = 9609
2019-10-30T14:30:21.587Z ce87e14b-2759-486f-8ff4-7a82c7e07cc7 > LVL:2 RC:   0        LAUNCHER :launchPcoip: launching session for user MYUSER
2019-10-30T14:30:21.587Z ce87e14b-2759-486f-8ff4-7a82c7e07cc7 > LVL:2 RC:   0        LAUNCHER :session pid = 9629
2019-10-30T14:30:21.957Z 00000000-0000-0000-0000-000000000000 > LVL:1 RC:-500        LAUNCHER :reapChild: Child process 9609 for desktop session died with signal 'Hangup'
2019-10-30T14:30:21.958Z 00000000-0000-0000-0000-000000000000 > LVL:2 RC:   0        LAUNCHER :terminate: Killing PCoIP server 9629
2019-10-30T14:30:23.958Z 00000000-0000-0000-0000-000000000000 > LVL:2 RC:   0        LAUNCHER :terminate: PCoIP server (9629) did not terminate. Killing again.
2019-10-30T14:30:23.958Z 00000000-0000-0000-0000-000000000000 > LVL:2 RC:   0        LAUNCHER :terminate: Killing PCoIP server 9629
2019-10-30T14:30:24.336Z 00000000-0000-0000-0000-000000000000 > LVL:2 RC:   0        LAUNCHER :reapChild: Child process 9629 for PCoIP server exited with exit code 0