Same here. Red footage is losing its audio waveform on the timeline, but not indicating the media is missing.
Mac Pro
Model Identifier: MacPro6,1
Processor Name: 12-Core Intel Xeon E5
Processor Speed: 2.7 GHz
Number of Processors: 1
Total Number of Cores: 12
Memory: 64 GB
AMD FirePro D700
Premiere Pro 13.0.3