Top panel: December 21, 23, and 24, 2015 where variability of the ∼25 km s⁻¹ Ca II K feature can be seen. Middle panel: Ca II K median spectra of three different campaigns using HERMES where the variability in the triangular profile is seen. The absorption at ∼25 km s⁻¹ disappears in March 2017. Lower panel: Na I D lines of December 2015 where the absorption at ∼23 km s⁻¹ is visible. The median of all spectra in the Na I D2 line where the absorption is no longer present is also shown. The vertical lines correspond to the radial velocities of the star and of the ISM.