reece:
Has your WBR declined over the last few months as well? How about click counts?
Have you registered your domain with ePN, so you can get credited for mobile traffic? Is your website usable on mobile devices? What are your mobile visitors' analytics like compared to desktop (increasing? time-on-site? page-views?) ?
In short, you'll want to trace back the changes that have occurred within the last 3 months. On the ePN side you'll want to examine things like click counts, WBR, and ACRUs. ... On your website side, I was emphasizing mobile traffic, but also of course you'll want to note if overall site traffic has changed much.
Do you track outclicks on your end? If so, how have those changed?
[Some Handy Aggregated Reference Info for ePN Affiliates and eBay Developers]