For the flat FLRW model of Universe evolution in RTG a new model of Dark Energy is proposed. It is a global
scalar field Φ with the quadratic potential. It ensures cosmological acceleration at the present time and a
bounce at the latе times. At the contraction stage Kazner-like growing anisotropy of Riemannian metrics will
break a mass-of- the-graviton bounce mechanism near the Big Bang in FLRW case. There is also noncyclic
option, when small enough graviton-mass-terms are significant only at the end of expansion. After bounce,
during next contraction epoch, an anisotropy grows and the matter density finally reaches the Planck one.