Server rebooted unexpectedly multiple times, wondering if outage?

Hello AWS team + forum,

We received an alert this morning at 7:42am from our NOC that our EC2 instance in us-west1 region had rebooted multiple times and memory was unavailable for 3 hours.

Can you please let us know if this is an outage in that region, or if we should investigate software cause for this?

Best regards,

tifbur2021

Here are the contents from our NOC's alert:

TAKEN: DATE: 01/27/2021 TIME: 07:43 AM

DELIVERED: DATE: 01/27/2021 TIME: 07:43 AM DELIVERED TO:

Phone: (914)219-1881
Email: declined
Priority: P1 CRITICAL
Users: MULTIPLE USERS

Message: Server EC2 instance name, is rebooting several times with
memory down for last 3 hours.