I'm starting to wonder if it was something running in the background that was maxing out the CPU.
Wi-Fi status didn't seem to make a huge difference whether it was on or off, but suddenly the uptime on a charge is back to normal.
Aldiko has started crashing on each resume though so it's possible that's related. Since there's an update for that I'm grabbing it now.
Fingers crossed that my uptime stays at normal levels
