I use a PW1 with the 5.3.4 firmware and I do have "PDF Low Memory" crashes now and then.
Typically, after I click "OK", it simply exits the book and returns to the standard "home screen". Then I simply click the book again and it opens it and I can continue to read it (fortunately it does remember the last page when dying).
However, I have also had several such crashes which did not end this way. Instead of the "home screen" it was displaying a "screensaver image" -> in such cases I had to perform a "cold reboot" of my PW1 (pressing the "power" button for a long time, 20 seconds or so) as nothing else helped.
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