We tend to think it's a sensor issue because that's what we notice first but a digital camera consists of sub systems much like a personal computer. Obvious of course is the image sensor then the controllers like camera functions (CPU ) and image processor that interprets the image sensor signals to form an image and also memory like ram and storage media. If any one of these sub systems fail or faulty it can show up as image readout faults or complete failure.
The linked articles below suggests a reset of the camera to its factory default settings but not necessarily pertain to your specific issue but try it anyway. The reset setting is in the cameras menu so search for it. Secondly you may want to replace the time and date battery ( cr1616) of the camera. Who knows how the camera's firmware really works. If all else fails then a visit to canon service center for an opinion.
Yes, it would be helpful to see an image with the EXIF info. It's possible, that something is wrong with the camera. However, it's also a good possibility that something is set incorrectly. Have you tried resetting the camera to it's defaults? Just from your description, I'd suspect Exposure...
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