I'm still getting an "undiscovered" state every 3-10 days with HG. Running on a RPi with r493 and a sufficient power supply (I've tried 3, so I don't think that's the cause), I get a condition where the blue light on the S2 stick will be lit, but no commands get through. If I rediscover the ZWave nodes it usually clears up the error. When that doesn't work, unplugging and plugging back in the Stick always seems to solve the issue. I'm running the latest firmware on the stick as well.
Is anyone else seeing anything like this? I've tried it on two different installations (VM and RPi) and while the periodicity is different the symptoms are very similar.