Did that first happen after refilling? The Nautilus 2 is a pain in the butt to fill without flooding the coil.
What worked for me to solve this: Blow into the drip tip repeatedly until excess liquid stops leaking out. Then give it a couple of short fire pulses with a very very light draw. Then try to use as you normally would. Repeat until flooding/gurgling stops and use as normal from then on in.
For filling what I do with a 50/50 success rate is this: Fill it, then screw on top slowly until you feel resistance (seal). Turn around, wait a few seconds, then screw it tight while still upside down. You'll probably have the odd drop of liquid on the outside of the tank when you turn it back, and that's a pain to wipe off with the stupid cage, but not a big deal.
It's a great little tank for flavour (not amazing, but good enough for the money). But more often than not I hate it. Stopped using it. Hope you have better luck with it!