X10 TM751 and "runaway" dims???

[Charles Sullivan <cwsulliv@xxxxxxxxxxxx>]

For some installations, sending any X10 RF dim signal to a
TM751 transceiver results in a runaway dim situation where
the lamp becomes totally dimmed.  And it may be necessary
to unplug the TM751 from AC socket to stop it from sending the
repeated PLC dims.

I've been led to believe that there is some sort of RF feedback
which causes this problem.  Can anyone explain the mechanism
involved?

Regards,
Charles Sullivan