Hi,
Are you facing this issue after an update? I noticed that your title is Windows update service issue. I have found a user Tyler Sosnowski facing similar issue which was solved by changing power plan. If it works, please let us know.
Also, if you are using a battery backup, UPS or PSU, they might be the culprit. Here are two examples, 1. How to find cause of 'Unexpected' Windows restarts, 2. Unexpected Restarts & shutdowns.
If you could provide more information about this issue, such as a screenshots, that would help a lot.
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