ODBC queries die; "Unexpected protocol character from backend"

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Hello:

I have a PostgreSQL 7.1.3 system which is accessed from an Apache CGI
handler via ODBC (driven by libiodbc-3.0.5). It has worked very well, but
on two occasions queries just stop working.

The Apache error log shows:

Unknown error;
Unexpected protocol character from backend (send_query), SQLSTATE=S1000
Unexpected protocol character from backend (send_query), SQLSTATE=S1000

and not much else. If I stop and restart the Apache handler, the problem
is resolved -- until the next time.

I see nothing in the PostgreSQL logs on the database server which would
describe a possible cause. I'm not sure if it is related (it probably
is), but the PostgreSQL logs contain many lines of the form:

pq_flush: send() failed: Broken pipe

Prior to these lines were occasional lines:

pq_recvbuf: unexpected EOF on client connection

but I would assume the user just hit stop on their client browser rather
than waiting for the query to finish.

Any advice would be appreciated.

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