Yeah that doesn't sound good.
How long have you had the mod.
Do you use good battery practice, like do you OWN a charger.
Oh heck HERE, do your research it will benefit you.
Bad's blog is probably more friendly for a newish vaper.
Baditude's Blogs | E-Cigarette Forum
You want to dig deeper?
Mooch's blog | E-Cigarette Forum
My question would be, like can you warranty the mod though? Because it is sort of my understanding that mechanical stuff can be all connected so if it is doing weird stuff, send it back for warranty. For all you (or I, honestly I don't know MUCH about electronics BUT smok is unreliable and I would hate for the mod to blow up. I'm not going to say that is SUPER LIKELY but it is for sure MORE likely when compared to a mod that WILL USB charge correctly, if you get what I'm saying.
Good luck, read up the good news is you can do way better in a mod. If you wish.
Anna