Yep, usually springs, attys, or battys...but I did have an odd short recently-
probably doesn't apply, but easy to check-
Not long after getting my stealth, it started getting hot button with every atty/iAtty I had..
they all worked fine on the other gg's too..drove me nuts.
I eventually found that the black delrin sleeve that the post threads
into on the bottom cap wasn't screwed in quite enough.
It wouldn't tighten more either. I could see a few plastic bits sticking into
the threaded hole down by the bottom cap, they looked like
they would be pressed between the post and the bottom cap when I tightened it down..
Then I was able to unscrew the delrin piece (not so easy usually) and found quite a few more delrin shavings
wrapped in the threading along with a tiny bit of moisture trapped from cleaning.
No damage, just extra plastic lol - Could have been one or all of these things,
but I cleaned all the bits out, wiped it down and put it back together tight-
I haven't had a short on it since.
Jus' spitballing, but who knows..