  The fluctuation-dissipation relation (FDR) is measured on the dielectric
properties a polymer glass (polycarbonate). It is observed that the fluctuation
dissipation theorem is strongly violated for a quench from above to below the
glass transition temperature. The amplitude and the persistence time of this
violation are decreasing functions of frequency. Around $1Hz$ it may persist
for several hours. The origin of this violation is a highly intermittent
dynamics characterized by large fluctuations a strongly non-Gaussian
statistics. The intermittent dynamics depends on the quenching rate and it
disappears after slow quenches. The relevance of these results for recent
models of aging are discussed.
