IB - List of Shortable Stocks

I don't know when the list is updated, but stocks that are shortable vary continuously through the day. I never use the list - I just try it to see if it works.
 
Any ideas on the short term swing of a stock due to its being unshortable or very difficult to borrow? I believe there must be some sort of correlation or trend in this type of situation.

any ideas?
 
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