Consider a person who undergoes the samadhi state once.
Is there a possibility that the person loses the power to reach the samadhi state after that?
No, there is no such possibility. Samadhi leads to moksha and moksha is not subject to the destructive force of time. Inability to attain samadhi would imply non-attainment of moksha. That would suggest that the person did not attain Samadhi in the first place.
One who aspires to overcome the thick darkness of ignorance should never seek contacts that are contrary to the fourfold end of life (Dharma, Artha, Kama and Moksha). Of these four ends, Moksha alone is accepted as the really stable value to be sought; for the other three are subject to the destructive force of Time.
Srimad Bhagavata Purana IV.22.34-35