Sony FX3 & A7siii Overheat FIX
The Sony A7siii and Sony FX3 Cinema Camera have an issue with an overheating warning that is easily fixed by changing the auto power-off temperature setting to high in the Sony menu system. Just go to the yellow setup menu at the bottom, choose tab 8 for power setting and change from standard to high temperature.
Now you should be all set to film all day long with your Sony FX3 or really just about any other modern Sony Alpha mirrorless camera.