So thank you for the tip, a bit of cleaning in the battery channel and at the 510 connector was enough, it probably got moisture. I’m eternally grateful, I don’t know how I didn’t think of that! 
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So thank you for the tip, a bit of cleaning in the battery channel and at the 510 connector was enough, it probably got moisture. I’m eternally grateful, I don’t know how I didn’t think of that!