NIM095738 has been addressed in the 10.2.1 product release which should be publicly available this December.
What we found was that GEP was clearing its cache before it found that it was unable to reach the feature service containing the enrichment data. Unable to refresh its now empty cache, the processor in the GeoEvent Service had no enrichment data and was therefore failing to enrich any events it received. The fix was to mark the cache as stale, rather than clearing it. If the feature service containing the authoritative enrichment data cannot be reached, the processor will continue using the "stale" data from its cache until the cache can be refreshed.
