Hello,
We faced with the problem that the Nexus 3 becomes non responsive after some period of time. We tried to do investigation from our side but there were no able to find something.
The issue is:
Only nexus 3 is running in the aws instance. The aws instance has 8 GB RAM, after few days, nexus 3 consumes most of the memory, and there is no more memory left.
From your description, it seems you had a paid license. Is that the case? If so, you should use our support system at https://support.sonatype.com, as indicated in the comment on that issue.
If you do not have a license let us know and we will re-open the jira issue.