Resistance jumping super high

I've been using rebuildables for awhile now and have never encountered this issue before. I'm running an ijoy combo rdta 2 on an ijoy captain pd270. After taking several hits the ohms will suddenly jump up to 7-9 ohms. It's typically around a 0.15 duel coil build. If I take the tank off the mod and put it back it's back to normal for another several hits. Also, it only happens with the combo. If I put my kylin rta on the same mod it's fine.

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