hi
theres a few posts on this subject. its happened to mine (a few times now)
and after getting on to the garage (for umpteenth time) there sending/getting trackstar to come out to me as seemingly they are aware of this with a few sti owners. and there is a software update for the tracker to stop it draining battery.i have to leave my bike optimiser on it if leaving it for even a few days now(halfords £20 od ) my cars a 53 plate and didnt start this till it was about a year old....still think i may have a duff battery as well but see what happens with getting trackstar updated..hope it may help some of you