Yeah thanks mate, I have. I even got a soft brush like the ones photographers use for cleaning round the edge of lenses, so I can be sure there's no dust in the bezel without pressing too hard on the glass or risking jamming detritus in there.
There's obviously a reason for it to be happening; I'm pretty sure it's not my fingers, so at the moment it looks like a firmware aberration. I haven't spotted a consistent pattern to it, though.
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