You right that it is a common myth that pool sand gets 'worn out' over time. Of course, this myth is perpetuated by pool stores who want to make money by selling you new sand! And, you are also right that sand can get channeled inside the filter. Doing just what you did --- opening it up and stirring it around ---- is a fix.
Also, sometimes a filter can get low on sand and just need to be topped off. This is especially true when a sand filter is paired with a too powerful pump. If the pump is too big, it just pushes debris through the filter without filtering it and it can also push sand through at the same time.
Thank you for your post and welcome to the Pool Forum!
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