d3.micro Postgres RDS resetting instance every day

Dear Customer,

I thank you for reaching out to us via AWS re:Post.

I think, to deep dive on the instance issues a support case to the Premium Support Team would help as they can critically analyze the issue and provide you the result.

[] Monitoring Amazon RDS API calls in AWS CloudTrail - https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/logging-using-cloudtrail.html

Apart from that, I would suggest, checking CloudTrail for any app/unwanted-user triggering the restarts(or maybe some automation) - I sincerely hope I was able to shed some light on the matter for you.