I have the same problem mate. I believe it to be a problem with the power load going through the timer. As it always seems to happen when I hook loads of stuff up to the timer, and use a multi-way adaptor with it. I understand you are not supposed to use them with multi-way adaptors. I am struggling with this problem but I have an analogue timer which I will try instead. I have remedied it before so that the clock doesnt go wrong so quickly by playing around with the ways the adapator and plugs are set up with the timer, but it tends to occur eventually. What I need is a timer that works with an adaptor and lots of plugs, any suggestions?