I don't think it's hardware related. I have both a 2012 and a 2013 Nexus 7, and both have had no trouble since upgrading to Lollipop. Both have been upgraded as each Lollipop update has been released. I cannot stress how crucial it is to wipe/format the cache partition after an update.
I'm not suggesting people aren't experiencing issues; I just don't think they're hardware related.
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