Just updated my a6300 and am testing to see how overheating goes. Shooting 4K 100bps in a room at around 72 degrees. I've pulled the lcd screen out (just have gotten use to this) to help in heat dissipation. Also running app hack on this camera, to be able to record longer than 29 min. If memory serves me right I normally ran into problems with heating at around the 29 min. mark when in-doors. I'll post back my results here shortly.