sorry clee
i aint got a clue y it would b doin that
did it start off with a full charge?
make sure the on off switch is off when u put it on charge
have u lifted the top off 2 nake sure all the conections r nice n tight?
apart from those ideas m8, im as stuck as u are
good luck with it m8, hope ive helped a bit & not told u how 2suck eggs :