In the last anelastic torsion studies in (TaSe 4) 2I, in the hertz range, we found two other effects in addition to the 265 K (1 Hz) Peierls transition. One is an anomaly in the shear modulus and internal friction at 50–60K, observed only when increasing the temperature in an helium gas atmosphere (from 200 to 600 mmHg). This anomaly is not thermally activated and has an energy of 0.05 eV measured from the internal friction width, being therefore attributed to the helium movement by a tunneling process between its positions in the lattice.The other is an internal friction peak superposed with a temperature-dependent background which encloses a step in the modulus, as a typical defect-relaxation phenomenon. It does not depend on the atmosphere inside the pendulum, as confirmed by changing from rough vacuum to helium, argon and nitrogen atmospheres, without changes in the spectra. The energy around 1 eV, the temperature peak 270 K (1 Hz) and the iodine excess composition respect to the stoichiometric one, allow us to propose it as an iodine point-defect relaxation.