Lyndel,

I did go into the setup screen shortly after I wrote the post and increased the brightness from only the first bar to the second bar as an experiment. Since that time I've seen no flicker but I'll keep you posted.

Bought my battery from Eric Remy - a super High-Capacity. That was last October (now that I've checked) and the problem started only a few months ago so its probably not the battery.

If the flicker starts again I'll reflash the firmware.

Thanks for the ideas.