Hi all. I have an audio timer, which is basically a digital clock that has a relay switched output, that I use as an alarm clock. when the set time arrives it drives a relay and the mains voltage is switched on on sockets on the rear, which powes a hi fi system and a light.. ok simple BUT this clock has statrted to gain up to 20 mins a day so is getting to be useless. does anybody know why this clock should gain quite so much time in one day?