  An apparent sudden change in the outburst recurrence time displayed by the
Rapid Burster occurred around the end of 1999. The time between consecutive
outbursts shrinked from ~200 to ~100 days somewhere between November 1999 and
March 2000. In parallel, the average peak intensity also decreased of a factor
about 2 in all outbursts occurred after November 1999 with respect to those
occurred before this date. I discuss these results by comparing them with
similar cases of changes in the recurrence time of other transient X-ray
binaries and with the behaviour of Dwarf Novae. A viable explanation is
connected with changes in the value of the quiescence mass transfer rate from
the secondary, although the detailed origin of these changes remains at best
speculative. Further, this result has important implications for programming
time-constrained observations of the Rapid Burster both in outburst and in
quiescence.
