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"server closed the connection unexpectedly"

"server closed the connection unexpectedly"

"server closed the connection unexpectedly"

I am trying to bulk load thousands of SHP files (TIGER2007 edges) into a PostGIS-enabled PostgreSQL db.  I am using a simple batch file to append each county:

    "shp2pgsql -a -s 4326 -D fe_2007_12085_edges.shp public.edges  | psql tiger2007 postgres"

Randomly (different each time I run it) it fails on ~5-10 files and returns the message:

    "psql: server closed the connection unexpectedly
        This probably means the server terminated abnormally
        before or while processing the request.
    Shapefile type: Arc
    Postgis type: MULTILINESTRING[2]"

I don't think the command is the problem- seems like PostgreSQL is disconnecting then reconnecting..  any ideas?

System: Windows Vista 64-bit, 6Gb RAM, PostgreSQL 8.3.7, PostGIS 1.3.5.

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