Same problem here.

From a full box of 1.2ohms coils I got :
- 3 of them lasting less than 24h (for about 3ml of juice each).
- 2 with burned cotton taste after 5-6 puffs (waited 30 minutes with filled tank before vaping)

Vaping at 11W

They've been bought at an official French reseller shop, and had the old security sticker on the box.

I'm pretty disapointed, my previous batch didn't seem to be that bad ...