I think your last sentence on your post nails the truth.
Its just "that". As you say "What's up? Is it all about uncertainty?"
When the market is trading like a headless chook you'll find traders and investors start to value companies differently, much more easily spooked, therefore head for entry gates and more so exit gates, quicker and sooner.
PNA has not performed any better or worse than with similar companies larger or smaller. This chart may let you see things a tad clear ( picture paints a thousand words sometimes)
Tried to do a smaller time frame for all to see here, but I just couldn't, so had to settle on a 3 month span sorry about that.
PNA Price at posting:
$3.37 Sentiment: LT Buy Disclosure: Held