Candy Aqua Viva 1200-clicking timer??

My washing machine Aqua Viva 1200 seems to run fine most of the time, but recently over a span of 3 weeks the timer/cycle indicator has starting clicking by itself, it would go around the whole dial but the wash has stopped while this is happening. This may occur mid wash or nearer to the end. What i do is switch the machine off, then on again...and go straight to a rinse or spin, and it is fine again. Then perhaps the next wash goes through no problem. It is still under warrenty, so luckily i will have someone coming out soon. I just wonder if you could give me any idea of what you think the problem could be? I look forward to hearing from you :o) Teresa.