The few seconds thing is kinda cool - I like it. If it sets his pocket on fire - it's a bad thing (just teasing!)
I go back to the post-mortem I did on mine, and my personal recommendation that they be stowed cartridge-side-down so that condensing juice can't run down into the battery and make the switch gooey.
I'm playing with a mod that addresses the (albeit rare) issue, but I won't have time to really stress test it for two more weeks... I have been able to reproduce it, but it requires either improper refilling, excessive humidity, moderately excessive heating and cooling cycles, or some combination - always combined with an angle favoring the battery side rather than an angle that would cause seepage to drain away from the battery to be wicked back up by the cartomizer.