This is the only error I get in the container log:
GLib-GIO-ERROR **: Settings schema 'org.gnome.system.proxy' is not installed
But when it appears isn't correlating to when the app service crashes.
Besides that there's a warning from s6 for app when the finish s6-maximumtime in the finish script times out. The rest of the log is normal output.
EDIT: To clarify, the docker keeps running but the app and openbox services quit. The display just goes black.