We present further evidence of the presence of acoustic oscillations on the slowly-rotating , over-active G8 sub-giant EK Eri .
This star was observed with the 1-m Hertzsprung SONG telescope , at the Observatorio del Teide for two different runs of 8 and 13 nights , respectively , and separated by about a year .
We determined a significant excess of power around \nu _ { \mathrm { max } } = 253 \pm 3 \mu Hz in the first observing run and we were able to determine the large separation \Delta \nu = 16.43 \pm 0.22 \mu Hz .
No significant excess of power was instead detected in a subsequent SONG observing season , as also supported by our analysis of the simultaneous TESS photometric observations .
We propose a new amplitude-luminosity relation in order to account for the missing power in the power spectrum .
Based on the evolutionary stage of this object we argue that standard \alpha ^ { 2 } \Omega dynamo can not be excluded as a possible origin for the observed magnetic field .