GeoServer GeoWebCache seeding dies prematurely
I found the answer to the issue, although there is no available solution. It is a known bug where GeoWebCache stops forcefully. It looks like there is no current solution for bug # GEOS-6278:
https://osgeo-org.atlassian.net/browse/GEOS-6278
If a solution is available in the future for GeoWebCache, I will update this post.