The S1 to SX60 series (also called the SX series or Super Zoom series) consists of ultra-zoom cameras with longer zoom ranges and a more extensive list of features. The SX100 and SX model cameras are a more compact, affordable spin-off of the S/SX series.
It's most likely a problem with the cameras sensors. If you can naviagte the cameras controls, try doing a reset to the cameras factory settings and see if that fixes it. If it doesn't, you'll probably have to send it in to Canon for service.
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