If an affiliate program is an important part of your business, your profits are only as good as your affiliate members. Sales drop like a rock when they get discouraged or lose interest.
You will see dreaded signs if you frequently visit your affiliates' sites. The banner or enthusiastic endorsement they once had on their opening page is now relegated to a link on second or third tier of their site. Something as simple as that can cut number of hits you get by a factor of ten or twenty.
Two things usually account for members giving you back burner treatment: Your product or service isn't selling as well as it once did for them. Or members are simply losing interest because newer, more exciting affiliate programs are grabbing their attention.
You can immediately solve both problems by offering a new or improved product or service. Spend time to make sure your new product is a big improvement over what has come before. The more you can insure your product is a big deal, more excited your affiliates will get.
Make your roll-out a big production. Give your new creation a whole new area with a fresh new look on your web site.
Two weeks before you unveil your new product, start sending announcements to your affiliates. Let them know something important is about to happen and they will be first to hear about it.
After you bring out your product, do a quick follow-up with members. Get comments on how they expect new product to sell. Harvest early accounts of how some members are doing well with product. Include these comments in your weekly email updates to members.