I am out of ideas Slayer, hopefully someone else will be more enlightened. I have been going over my Naut with a fine tooth comb since last night trying to find an idea beyond what you have already tried.
Have you still got the packaging for the tank and coils? If so, maybe go online and check that they are genuine.
Have you still got the packaging for the tank and coils? If so, maybe go online and check that they are genuine.