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this has happened to me too with one of my best income winning keywords with ctr of 7%.
I found that i could delete the keyword, then add it again and it seemed to keep its history and was added as "normal". This has happened a couple of times in the past week, so i keep checking it to make sure it's still "normal" otherwise i delete and add again.
I am not sure if maybe this was the cause - i had the keyword in caps when it was getting disabled, but when i put it in lower case it wasn't. it has been ok for a couple of days now. fingers crossed.
I think the main problem with that keyword is its a high volume generic kw .Other advertisers would probably have a poor CTR and i believe the historical poor CTR of others is haunting me.
Hope atleast in the new algo they would limit the scope of external CTR affecting a individual's Keyword Quality Score!
But AWA ,when a keyword have 11.8% CTR its hard to argue that the ad is not performing well :) .
IMHO the current algo place too much emphasis on the global CTR thus punishing smart advertisers who can produce good CTR with better relevant ad copy .Hopefully this changes with the new algo!
I want high sales (CR), not CTR... in fact, the higher the CTR, the higher the chance I'm paying for people who aren't true prospects.
Right now, I'm targeting 1-3% CTR... if it's 4% or above, and it's on a product that's really expensive, I put the price into the ad.