Aurora MySQL 5.7 randomly fails

This is the 5th time. It happens once a week (Tuesday or Wednesday within 03:00-07:00 UTC+0). On the console, it shows available but inaccessible. We try to wait if the instance will recover itself, after ~30 min nothing happens. So I reboot it manually, then it came online again after rebooting (~5 min).

It would be helpful to know what actually went wrong. This is only a dev server with few users and records.

Engine: Aurora MySQL 5.7.12
DB instance class: db.t2.small
Backup time: 16:00-16:30 UTC+0
Maintenance time: sun:17:00-sun:17:30 UTC+0

Below is the only list of available logs after rebooting the instance.

```
error/mysql-error-running.log.2018-07-24.03 Tue Jul 24 11:14:06 GMT+800 2018 11.8 kB
error/mysql-error-running.log.2018-07-24.04 Tue Jul 24 11:30:00 GMT+800 2018 285.5 kB
error/mysql-error-running.log.2018-07-24.05 Tue Jul 24 12:30:00 GMT+800 2018 31.1 kB
error/mysql-error-running.log.2018-07-24.06 Tue Jul 24 13:30:00 GMT+800 2018 31.8 kB
error/mysql-error-running.log.2018-07-24.07 Tue Jul 24 14:30:00 GMT+800 2018 32.9 kB
error/mysql-error-running.log.2018-07-24.08 Tue Jul 24 15:30:00 GMT+800 2018 29 kB
error/mysql-error-running.log.2018-07-24.09 Tue Jul 24 16:30:00 GMT+800 2018 32.1 kB
error/mysql-error-running.log.2018-07-24.10 Tue Jul 24 17:30:00 GMT+800 2018 27.5 kB
error/mysql-error-running.log.2018-07-24.11 Tue Jul 24 18:30:00 GMT+800 2018 31.7 kB
error/mysql-error-running.log.2018-07-24.12 Tue Jul 24 19:30:00 GMT+800 2018 27.1 kB
error/mysql-error-running.log.2018-07-24.13 Tue Jul 24 20:30:00 GMT+800 2018 22.4 kB
error/mysql-error-running.log.2018-07-24.14 Tue Jul 24 21:30:00 GMT+800 2018 22.8 kB
error/mysql-error-running.log.2018-07-24.15 Tue Jul 24 22:30:00 GMT+800 2018 24.7 kB
error/mysql-error-running.log.2018-07-24.16 Tue Jul 24 23:30:00 GMT+800 2018 24.7 kB
error/mysql-error.log Wed Jul 25 00:34:45 GMT+800 2018 2.6 kB
external/mysql-external.log Wed Jul 25 00:30:00 GMT+800 2018

Special thanks to @WilsonHauck. After 4 weeks of monitoring, Manually upgrading Aurora to the latest version solves the issue.

There have been several bugfixes addressing unexpected restarts on 2.01.1. https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/AuroraMySQL.Updates.20Updates.html

To manually upgrade your Aurora:

• Go to RDS - AWS Console

• Navigate to Clusters

• Select your cluster

• Click Actions >> Upgrade now

StackExchange Database Administrators Q#213030, answer score: 2