Hi these need at least 10v on engine cranking or they lose presets, mines the same fine untill you crank engine then voltage drops below 10v and the stereo resets,
you need to put a capacitor and diode in permanent live feed,
if you get the right size this should hold enough voltage to stereo, though only if you dont crank too long,
maplins will sell bits
oldzed
April 2012