I'm having he exact same issue both with Coupons and with Support. I set up a coupon and it runs for 4-5 hours just fine and allows customers to use it. Then, it will suddenly changed to suppressed. I have sent multiple requests to support along with screenshots showing exactly what is happening and all they do is respond that my ASINS don't have enough sales history - even though they are getting sales daily and the coupons ARE working at first. They have been absolutely no help and it's destroying my Mother's Day Sales. I can't lower the price either b/c then if and when the coupon glitch gets fixed, the ASINS won't qualify anymore. Either way, I cannot win. I am so upset about the lack of help and Amazon's refusal to admit there is a major glitch with these new requirements.