By the way, out of curiosity, what type of atomizer are you using?
I ask because I had a problem with my ELA similar to yours. I was a slave to cleaning.
I have come to a possible reason for my problems. I was using an atomizer with a 510 air intake rather than like most modern atties, having the intake on outer side.
I believe, and this is just a theory, that all the condensation made its way inside the top contact pin. It has a pressed housing and I think juice eventually made its way inside and no matter how much I cleaned, I just could not get it out.
I sent it in to ST a few months into heavy use, and they replaced the top cap and it worked again perfectly for a while.
Like I say, Its a theory... I have no way to prove or disprove. All I know is many have been using theirs with no problems for years now and the only thing other than some sort of other problem, is they used atomizers with side air.