My venerable Canon 5DMkII (with Hutech mod) has become increasingly prone to shutting down while imaging using the DC Coupler DC DR-E6. The coupler replaces the battery in the camera and connects, via a voltage adapter, to a 12v marine battery to keep the camera powered for hours. The camera works fine while on its LP-E6 battery, but shuts down after three or four minutes when I use the DC adapter. It shuts down more quickly while I'm using Live View - 10 seconds or less. This problem has gotten worse over the past few months.
I've replaced the DC Coupler but the camera still shuts down.
I suppose the connectors in the camera may be failing to make contact with the Coupler, or (egad) perhaps the electronics in the camera are beginning to fail. Because it happens more quickly on Live View, it could also be a thermal problem.
Has anyone else had this problem and found a solution?