After several minutes of conversation, my FaceTime correspondent’s voice starts coming in gravelly, then her incoming audio stops altogether. Her incoming video remains fine, as does my outgoing voice/video to her.

She reports that her FacetTme connections with other correspondents are trouble free, and there’s no such problem when I reestablish communication with her using Skype, so the fault is evidently with my FacetTme app. (Shouldn’t be corrupt; I recently did a clean install.)

I’m guessing a cache somewhere fills up. Whatever .... What can I do about it?

Facetime v1.1.1 (309); OSX10.7.5; MacPowerBook Pro, 13 inch, late 2011.