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What would be considered a "technical problem"?
I've had SEO people tell me it wasn't Panda...
I even made the HUGE mistake of going over to G's forums and asking for folks there to give their input.
But if you saw what WAS ranking in the top 10 for my keyword phrase - you'd feel the same. It's sites that are doing everything that Panda says NOT to do.
I feel like - whatever the issue is - it's unfair.
I feel like there is some good that has come from it all. I update more, my site is more user friendly, I've gone back to basics where money isn't the motivator - it's writing to my audience and having rapport with them. Those are good things.
But I come to WW and read the forums and I swear it makes me more crazy and frantic. I think.... "oh gosh - I should be doing what this person says..." or "I need to remove these 100 pages because they think maybe that could be an issue." It's madness. It's upsetting. Because I'm like a child mimicking my parents and parents aren't always right. LOL
Personally, I have deleted 30,000 pages and canonicalised plenty more. And, each time I consolidate, the remaining pages do better and better.
Also, I would really, really suggest you get someone to look for any technical problems with your site.
How many is too many? We don't know. But, those chasing the algo have been forced to look at how they are doing things and have discovered, they CAN consolidate, refine, combine, publish the same info in far FEWER pages and seen some SE "love" return. But no one, to my knowledge, has ever regained 100%+ of their prior Panda levels.