Dell XPS 9570 , shutdown hangs when laptop runs for a week for running computation task + ubuntu 16.04 LTS

Hello Dell team, I'm reaching you out to point out an issue with abnormal shutdown behavior of this dell laptop if I keep alive the laptop for a week for running some computational task. === Environment - 4.15.0-60-generic Ubuntu 16.04 BIOS 1.14.0 === During the computation process, syslog is filled with below messages. +++ Jul 13 07:39:25 kernel: [933313.842619] CPU1: Package temperature above threshold, cpu clock throttled (total events = 82654993) Jul 13 07:39:25 kernel: [933313.842620] CPU5: Package temperature above threshold, cpu clock throttled (total events = 82654985) Jul 13 07:39:25 kernel: [933313.842621] CPU2: Package temperature above threshold, cpu clock throttled (total events = 82654993) +++ Below is the Shutdown hang logs for your reference. +++ Jul 13 19:28:12 nvidia-persistenced: Shutdown (1920) Jul 13 19:28:12 bluetoothd[1085]: Endpoint unregistered: sender=:1.69 path=/MediaEndpoint/A2DPSource Jul 13 19:28:12 bluetoothd[1085]: Endpoint unregistered: sender=:1.69 path=/MediaEndpoint/A2DPSink Jul 13 19:28:12 systemd[1]: Stopping Session c2 of user. Jul 13 19:28:12 systemd[1]: Stopping User Manager for UID 1000... Jul 13 19:28:12 systemd[1]: Stopping Save/Restore Sound Card State... Jul 13 19:28:12 systemd[1]: Stopped target Sound Card. Jul 13 19:28:12 systemd[1]: Stopping Authenticate and Authorize Users to Run Privileged Tasks... Jul 13 19:28:12 systemd[1]: Stopping Manage, Install and Generate Color Profiles... Jul 13 19:28:12 systemd[1]: Stopped Daily apt upgrade and clean activities. Jul 13 19:28:12 systemd[1]: Stopped target Multi-User System. Jul 13 19:28:12 systemd[1]: Stopping LSB: daemon to balance interrupts for SMP systems... Jul 13 19:28:12 bluetoothd[1085]: Stopping SDP server Jul 13 19:28:12 systemd[1]: Stopping Regular background program processing daemon... Jul 13 19:28:12 bluetoothd[1085]: Exit Jul 13 19:28:12 systemd[2763]: Reached target Shutdown. \Jul 13 19:28:12 systemd[2763]: Starting Exit the Session... Jul 13 19:28:12 systemd[2763]: Stopped target Default. Jul 13 19:28:12 systemd[2763]: Stopped target Basic System. Jul 13 19:28:12 systemd[2763]: Stopped target Paths. Jul 13 19:28:12 systemd[2763]: Stopped target Sockets. Jul 13 19:28:12 systemd[2763]: Stopped target Timers. Jul 13 19:28:12 systemd[1]: Stopping Unattended Upgrades Shutdown... Jul 13 19:28:12 systemd[1]: Stopping OpenBSD Secure Shell server... Jul 13 19:28:12 systemd[1]: Stopping Make remote CUPS printers available locally... Jul 13 19:28:12 systemd[1]: Stopped Runs Laptop Mode Tools - Polling Service, every 150 seconds. Jul 13 19:28:12 systemd[1]: Stopping LSB: Speech Dispatcher... Jul 13 19:28:12 systemd[1]: Stopped Initialize hardware monitoring sensors. --->>> It hangs here... ++++ This problem is not able to reproduce every-time. But this is the first time I noticed this problem. When I run this laptop for a week. Something is blocking the shutdown process while graceful hit. Please explain how to avoid this issue in future? or this is related to some Bug with this Dell XPS 9570 ? Please confirm, Thanks Jay