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Appreciate the suggestions.
I use invisible glass, too, great stuff. New blades didn't help. It started about six months ago after operating well for a year and a half. I can't see anything out of whack regarding the shape, but it behaves like there's something wrong with the shape. Have cleaned the blades carefully and, I think, well -- it's doesn't leave narrow streaks I associate with grit or critter or crack on the blade. Lots of traffic, but not highly polluted, good air quality days.
Again, appreciate the ideas. I'm still stumped. If I figure it out, will advise in case y'all encounter it.
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