I initially thought battery and then remembered that when it happened on my last one 15 miles to work and it was fine untill the next long stand. QUOTE]
Does that not reinforce the battery theory? The ride to work put a tiny bit of juice back into the battery, enough to keep the clock happy, but after standing for longer it died?
I had exactly the same thing on my 1100, it disappeared never (yet) to reappear when I changed the battery.
Paul G