  We present a spectroscopic monitoring of the transient nova V4745 Sagittarii
(Nova Sgr 2003 #1) covering ten months after the discovery. During this period
the light curve showed well expressed transient phase in the form of six
rebrightenings, and the presented dataset is one of the best spectroscopic
coverages of a classical nova during the transition phase. Low- and
medium-resolution spectra revealed that the majority of spectral lines switched
back to strong P-Cyg profiles during the mini-outbursts, similar to the spectra
just after the major eruption. We interpret the observed phenomena as evidence
for ``echo-outbursts'' resulting in episodes of secondary mass-ejections and
propose that the transition phase in classical novae is driven by repetitive
instabilities of the hydrogen shell burning on the surface of the white dwarf.
  From the available light curve data we estimate the absolute magnitude of the
system of about -8.3 +/- 0.5 mag. All spectrophotometric pieces of evidence
point toward a very low (E(B-V) < 0.1) interstellar reddening, leading to a
rough distance estimate of V4745 Sgr (9 kpc < d < 19 kpc).
