Transponders and ATC's Radar

Has anyone out there experienced transponder problems with one controller
but not with a subsequent controller after a hand-of?

For the third time yesterday (with the other two occurring over the past
year or so) a NY Approach controller informed us that our transponder was
only responding with a squawk and altitude once every couple of minutes or
so. However, upon hand-off to another controller (who I believe was in the
same facility), it was rock-solid. This has happened a couple of times
before--all with NY Approach--where one guy said our xponder was inop and
the next guy said it was fine. I don't think it was a warm-up issue since
the last time it was on the descent from a long flight.

Any ideas? I don't want to send-off my transponder for service unless I'm
reasonably sure that the problem could be with the box.

Marco



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