  We report on the systematic analysis of the X-ray observations of the
ultra-luminous X-ray source XMMU J122939.7+075333 located in the globular
cluster RZ 2109 in the Virgo galaxy NGC 4472. The inclusion of observations and
time intervals ignored in previous works and the careful selection of
extraction regions and energy bands have allowed us to identify new flaring
episodes, in addition to the ones that made it one of the best black hole
candidates in globular clusters. Although most observations are too short and
sparse to recognize a regular pattern, the spacing of the three most recent
X-ray flares is compatible with a ~34 hours recurrence time. If confirmed by
future observations, such behavior, together with the soft spectrum of the
X-ray flares, would be strikingly similar to the quasi-periodic eruptions
recently discovered in galactic nuclei. Following one of the possible
interpretations of these systems and of a peculiar class of extra-galactic
X-ray transients, we explore the possibility that XMMU J122939.7+075333 might
be powered by the partial disruption of a white dwarf by an intermediate mass
(M~700 Msun) black hole.
