Being that they're new, I'd go with the rest of the crowd and say they need to be broken in.
I have a love-hate relationship with them. I love them when they're new and working great then I hate them when they start acting up. When I'm down to one good, working atomizer, I put in an order for 2 more. I blow out and wash my mis-behaving atomizers in warm water, then stick them in my jar-o-PGA and let them sit there. I'll use them to try new juice or my DIY experiments. My husband got 2 atomizers with his 510 kit a month ago and is still using the first one he started with. He says to me last night as he eyeballed my jar, "Exactly how many atomizers do you have?" I've been at this for over a month and a half (not very long at all) and I have 8 atomizers in my jar already. lol I just placed an order for 2 more this morning and some cartomizers because I've never tried them before and with my atomizer luck, these are probably the least expensive way for me to go. I have issues with them. I think it's my juice experiments that degraded most of them.