Amazon affiliate earnings keep decreacing?

Anyone else who suffer from decrease in earnings last couple of months from amazon associates?

I'm down 50% in earnings from just 2 months ago. Conversion is down from 6-8% to 3-4% and I don't know what's going on?

When they changed the comission few months back I didn't see much loss in earnings but now something is seroiusly wrong with amazon.

This can happen for many reasons, most earning streams will not be constant over time.

It seems your conversion rate decrease is the main cause, is the traffic stable? How often do you update your site? How do you rank? How competitive is the niche? What do other marketers do differently? Is the product evergreen? Without knowing more it is hard to pinpoint what is going on.