So i have been using these 10 cartos that i ordered for about i dunno 3 weeks now... im down to 7 well i have noticed that sometimes they dont come on so i unscrew them screw em back on ....sometimes that helps sometimes i have to tap them for them to work....well i just noticed tonight that its only with one of my batteries that i have to do this with.....so is my batter crapping out, not making the proper connection or what?