When I read the title, I got the impression (before I read the first post) that it was a vaping dating site where boy and girl vapers get together to biff on about vaping with the added bonus of a shag.
How wrong was I.
Date Vape? Did they seriously try to make some messed up pun there
The fire button losing clickiness is a bad feature of those Tesla mods ... I assume it's the Nano 100W? I had two in the plain finish but never had the other issue you report.
In your shoes, I would get my money back from Date Vape UK ... product not fit for purpose. Check the T&Cs of sale, you might have to pay for returning it.
Good luck.
Don't think this is exactly legal: