It sounds like the coil was just flooding due to lack of power. The Nautilus coils really like to be run in the 12+ watt range and if the battery power drops below that then you end up sucking more juice into the coil than it can convert to vapor. The result is often gurgling, leaking, or "spitting" juice up the drip tip which is what you're describing.
Shouldn't need to do a thing to the coil. Just give it more power.
If it's already flooded you can turn the whole thing upside down and take a few puffs. You WILL get some juice in your mouth this way, but it will clear out the excess after 2-3 puffs and then should work fine after that.