Same problems with my Epic-M. Fan set to manual 30/100. After about 20 mins into the interview, temp hit the critical mark and the fan went up to 100%. Had my Red One MX recording at the same time without any problems. I have recorded interviews of 1 hour and longer in very confined and hot enviiroments with tungsten lights without any issues. The Epic size must be contributing to poorer heat dissipation. I'm going to try John's idea to remove the front grill and see if I can get away with a higher fan setting during takes without the sound dept throwing their toys. Also going to try my Epic-X next time and see if it copes with longer takes.