coils burnt out

I purchased a Twisp Solo a few weeks ago. I recently tasted a burnt taste and so I replaced the coil with one out of a pack of three I purchased at a Twisp store. I have made sure to always have enough oil in device and also not to let it get too hot, but I've had to replace the coil 3 times now in the past 4 days. The new coils simply burn out for no reason. the original coil that the Solo came with lasted 2 weeks. The new pack last a day???!!! These coils are expensive too. I'm frustrated with this product. I love the twisp, but these new coils are ridiculous and a waste of money! i feel cheated.