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If so, I'd suggest that, given time, your site will recover from any spoiling effect that these links have had on your site. It can take a few weeks for the Adsense robot to get the best serving ads for you.
Alternatively, it might just be the natural ebb and flow of eCPM. In which case, just leave things as they are and you'll get better results at some point.
If you make unnecessary changes, it might interfere with the Adsense robot's task of maximising your site income and suppress your income for even longer.