Just under the screw on mouth piece is a small rubber cover with a metal looking tip coming up
thru it. this would be covering the wicks and heating element. see if you can pull it up some. could be it's gotten pushed down from using it, when refilling and screwing your mouth piece back on.
that happened to me and fixed mine that way. also added an o-ring from a previous tip to make it so it won't screw down too far.
Ive been using the same clearo since the first co-op round one, i think mid to end of Nov, beginning dec. hell i dont know when, but its sometime around there, lol