OK so I recently got a x cube mini and a dark horse RDA but whenever I go above 30 watts it shows a battery low symbol and the batter is brand new and yes I have charged it. Also i can sometimes get it above 30 but its just random and it always does it at 1.5 seconds into the pull and its at random so if I turn it the watts down it will work for a little while then I have to try them down again and again. So whats wrong with it?