I have this problem on my C70 as well and to be honest I just feel sorry for the neighbours. Worst thing is when it goes off I can't get to it as I can't mumble through all the keys quick enough, or I am in the bath or fast asleep lol.
Mine happened daily for about a month last year. I thought it may have been a small fly that got in so just left the windows open one afternoon whilst giving the inside a good clean and vaccum. After that it was fine.
It then happened twice last week, but this was only when trucks went past causing the whole street to shake as they fly over the speed bumps.
I will check my coin holders and also ensure the air vents are set correctly but all seems ok at the minute.
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