Frigidaire Upright Freezer. All appears to be working fine, temperature is maintained. When you open the door, sometimes the interior light flashes. It will come on, then you hear a click in the control panel on the door and the light goes off. It comes back on, and then clicks again and goes off. Each cycle takes 2 to 3 seconds. The display on the control panel is changing from F to C with each cycle of the bulb flashing. This continues for over a minute sometimes, and only a few cycles sometimes. It does not happen every time. Closing the door (or manually pressing in door switch) makes everything work fine.

My concern is that this indicates a problem about to happen - perhaps the control panel. Searches for interior light flashing have come up with nothing.