Aspire Nautilus Coil Atomizers are terrible!!

I have been using these coils with my tank for years. But the last shipment I got must have gotten skipped on quality control. We have been going through these like underwear. They start to turn black really quick and then lack no flavor after a week of mild/moderate use. We have not changed liquids, have been using the same liquid with these brand of heads for years. Is there another alternative??? Please help!

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