You kidding dude?
If the designers didn't lazily make the switch make direct contact with the post below the 510, this issue wouldn't exist. It's not user error at all. They ....ed up the design, and people who aren't aware of these issues will almost definitely encounter a potentially serious problem.
I realize you proudly own three, but you shouldn't be defending this dangerous piece of garbage, and if you truly are an experienced vaper (with any concern for their safety) you'd discard these hunks of junk in exchange for any one of the hundreds of safer devices out there.
Also the 300$ authentics have the same issue as the clones.
Get tired of seeing the same argument time after time after time.
Life is dangerous. None get out of life alive.
Making fireworks is dangerous. Reloading ammo is dangerous.
The best we can do is learn and work from knowledge instead of fear and paranoia.