I have heard of a few "fixes" for sticky auto switches, of course it also depends on which model you use. For 510 and l88b (blu)
batteries and maybe a few others, you take the battery while it's unattached to anything (no atty cart or whatever) and you draw hard on it as if you were
vaping it from the connection side. Draw hard on it a half dozen times or so, then reattach your atty or carto and test vape. If it works, yippie, if not, try again.
If that fails, some have mentioned that a few light taps on the LED end of the battery against a solid surface has worked for them.
I used to be an auto battery user. I liked being able to use them "hands-free" but finally decided that consistancy was more important than a negligible convenience and switched to manual
batteries. I still have a few auto pieces but use them rarely. Most of my friends switched as well for similar reasons.