I believe it's e changeable atty head, as a few of my friends experience e same problem. U need to ensure tt e
tank cover cap is fixed on properly. Try changing e angle or ensure tt e cap is flushed and doesn't get stuck in e pointy head.
Yes, it's a bit finicky, but i believe it's a short term thing.
Clean e tank cartridge properly and wipe down e coil head wen changing flavours. I tried on my friend's setup. Not too bad but vapour is not......... fluffy enough. Maybe u're btr off with a carto tank or clearos, just an opinion.