RFC ERROR on BEX query

Question: Received an RFC ERROR on BEX query, results not returned, session closed.

Using BW 3.1, SP19, Bex query on a MP over an Infoset (ODS and Cube).

Query normally very reliable, no pror issues.

RFC ERROR recurs randomly when query is run (errors 1 out of 3), recurs with only certain criteria, the other times runs as expected.

Anyone with this experience?

Answer:
Any responses?
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