jump of 0.2 cycles is observed in the pulse phases of the fundamental (**jump A**, see Fig. \[jumps\]). Two similar pulse phase jumps of 0.1 cycles are observed (**jump B** and **C**) when the QPO is not detected, with rms amplitude upper limits of $\sim30$ and $\sim10$% rms (98% confidence level). We call these phase changes “jumps” as opposed to the “drifts” observed during the fast decay stage (§ \[fastdecayjump\]), since the $0.1-0.2$ cycle jumps are sudden, occuring on time scales of a few hours or less, while the 0.2 cycle drifts take $4-5$ days.

In the 2005 outburst we see something very similar, although the re-flares have a sampling that is much worse: the observations are rather sparse and are separated by at least 1 day. In both the 2002 and 2005 outbursts, the pulse phase in the jumps is close to the pulse phase prior to the beginning of the fast decay stage (see § \[fastdecayjump\]).

In the 2000 outburst the observations are rather sparse, with gaps of several days between observations. However also in this case when the QPO rms amplitude is low or the QPO is undetectable, the pulse phases are observed to jump by $\sim0.1$–$0.2$ 