  We report on the long term monitoring of the GINGA transient source GS
1826-238 performed with the BeppoSAX Wide Fiels Camera (WFC) instrument, during
four different observing campaigns covering October 1996 - September 1999. WFC
detection of type-I bursting activity from the source ruled out its proposed
black hole candidacy and clearly suggested the compact object related to GS
1826-238 to be a weakly magnetized neutron star. The analysis of the arrival
times of the observed 78 bursts lead to the discovery of a recurrence of ~5.75
hours with a spread of 38 minutes (FWHM) along more than 3 years monitoring
data (Ubertini et al., 1999). We performed a more detailed analysis of the
whole available data, and evidence of shortening of the recurrence time,
together with a drastic narrowing in the spread (down to a few minutes) was
observed on a one year time scale. Possible relation with the source X-ray
persistent emission is discussed.
