source audio is 48 khz AAC . Project settings 60 fps , 24 bit 192 khz Best , Stereo. No Video . only 1 audio Track . The 3 default audio FX Effects are OFF( track controller FX ) . i believe the source audio type ,...AAC has nothing to do with this .
in about 15 minutes of playback : Time Code , Play Head cursor , Level meters and Loudness meters ALL the above Stop responding( freeze) , while audio continues to play normally . The play head cursor magically returns to the begining of the Track Controller . Seems to occur with All versions of Vegas\Pro.