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Joined: Aug 2005
I was going to suggest replacing the backup capacitor. The problem with doing so, of course is that you have to open up the 42S, which is not that easy.
The capacitor in question is a 100uF 10V surface mount part connected across the battery connections (via PCB tracks) and it's the largest capacitor on the PCB.
It's not hard to find. Nor is it hard to get a replacement -- it's a standard part. RS components/Electromail sell them in the UK
(the only problem being you have to buy 10). If you're used to doing SMD rework, it's easy to change as well..
Oh yes, don't take the 10V rating too seriously -- some machines have a 6.3V one. Anything greater than the battery voltage is fine (provided it'll fit in the case) -- 10V is the easiest one to find in my experience.
I've also known this capacitor become leaky and drain the batteries quickly -- something to check if you have that fault.