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We present the analysis of a multi-epoch spectroscopic monitoring campaign ofthe O6Ief star lambda Cep. Previous observations reported the existence of twomodes of non-radial pulsations in this star. Our data reveal a much morecomplex situation. The frequency content of the power spectrum considerablychanges from one epoch to the other. We find no stable frequency that canunambiguously be attributed to pulsations. The epoch-dependence of thefrequencies and variability patterns are similar to what is seen in the windemission lines of this and other Oef stars, suggesting that both phenomenalikely have the same, currently still unknown, origin.

Epoch-dependent absorption line profile variability in lambda Cep