A softener will generally make a high pitch squeal when it is backwashing. This is generally the first cycle in most softeners. It may also do this during the final fast rinse cycle. The second brining cycle takes about an hour. That is why you may have a delay in the squeal. Also I have seen at times when a power surge can force the drive motor into a short backwash. Usually just a few minutes. It may help to put a surge surpressor at the water softener plug.
RJ
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