No. I have had only positive results from SedoPro, and in any case they guarantee earnings of at least 10 percent more than your prior earnings. If it continues, speak to your account rep.
Edit: I see your question was on particular domains, not on your account in general. I've had domains that have had major drops in CTR. It happens all the time. And sometimes they go up, the same way they went down. It could be the adverts that are popping up for you now on these domains, and nothing to do with SedoPro.
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