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This can be due to a multitude of issues, but generally, a check on your instance metrics would be a good start:
answered 5 years ago
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Another thing to look into is whether you're exhausting your instance's burst capacity: https://lightsail.aws.amazon.com/ls/docs/en_us/articles/amazon-lightsail-viewing-instance-burst-capacity#identifying-instance-burst
answered 5 years ago
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asked 5 years ago

You'll need to share more details if you want help with this issue. Relevant log snippets with errors, software stack, what's happening when the instance crashes, what you have tried so far, etc.
Yes, more details are. crucial. How is it crashing? What blueprint are you using? What size is the instance?