Shut Off

I've been using nautilus tanks for months, I buy my coils from a top notch supplier, so I don't think they are a knock off, but for the past 2 months or so my mods are turning off for no reason, this is happening right after I let go of the power button, I run mine at 7.0w I've had 2 mods replaced and bought 2 new ones, they all do the same thing, tried different batteries also, could this really be the coils?

Thanks
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