This is quoted from the defunct Bruce Wagner Bitcoin podcast:
Bruce Wagner : When was the last time you chatted to satoshi
Gavin Andresen: Um... I haven't had email from satoshi in a couple months actually. The last email I sent him I actually told him I was going to talk at the CIA. So it's possible , that.... that may have um had something to with his deciding
Link to source/timestamp?
I'd love to hear this part, but not enough to listen through Bruce Wagner's podcast.