kashley

You are both correct.  The problem is with the Crown.  It has so much airflow I can not get a warm vape with 1.2 ohm coils.  In fact with the airflow open only a fraction it is not a good vape.  The .5 coils are better but in the 50+ watt range he is running the .25 shines.  It says it is for 80 to 100 watts, but with my juice 60 is pushing it.  The funny thing is the Crown is cooler at 55 watts than my NEBOX at 35, so it has to be the airflow.  (of course the Crown is putting out 2 to 3 times the vapor)
It is defiantly a cloud producing tank.  I only use mine at home, and as a backup, but it is by far my favorite tank!

You could be having one of 2 problems the first is your juice.  I have had a bit of trouble with wicking in the MAX VG juices in my Crown.  I have gone back to 70VG/30PG and 60VG/40PG in mine.  If your juice vendor changed suppliers for their supplies it can change how your juice reacts to the heat. I use the .25 ohm SS coils. I normally run in Temp control at 40 - 50 watts.
It could also be the coils.  There was a batch that went out a while back that had quite a few bad ones in it.
One thing I am pretty sure of is it isn't the iStick.  It just supplies the power.  You control how much.  If your resistance is changing it could change the voltage settings compared to the watts set on the screen, but, you can still turn it up and down to produce the proper vape.  This isn't nearly as big of a problem in Wattage mod as it would be if you were using Temperature control.  You might try cleaning all of the connections in the tank and mod to see if it reads a little closer to what you are used to.
 

I'm pretty new to vaping, but I did a google and this looks helpful:
https://www.slimvapepen.com/vape-pen-giving-bad-burnt-taste/
 
I hope it works <3
-K

I will type exactly what the battery says.
2000mAH
Input: 4.2V
Output: 4.2V = 40A
Compatibility: 0.3 - 1.0 ohms
I've never had a problem before and I've had it for nearly 4 months. What would cause this to happen all of the sudden when I haven't changed anything but the coils it came with? And btw I've replaced the coil before and it never did this.