The Securities Exchange Act of 1934 requires that publicly traded companies must report to the SEC whenever a member of the Board or certain officers resign. Also, the SEC has a database named EDGAR that is open to the public. After a little research, I discovered that corporations must report said resignations on Form 8-K, Item 5.02. From there, it was a simple matter of searching only Form 8-Ks within a specific range of dates, and including the boolean search terms “Resigns” and “Resignation”.
I felt this would at least offer us a baseline comparison to see if there is truly an uptick in resignations, or if it just appears that way. I think you will be interested in the results.