Had an interesting glitch occur with my new Mighty that i've never read about before. It had a full charge, and I was going to have a sesh with it plugged in to bypass the battery since it was full. When I turned it on it was showing 211c and stuck on it! I couldn't move the temp up or down, and after a reset no difference. So then I unplugged it and turned it on and it showed 180c so somehow reset itself. Weird!
I'm starting to think that when I think there should be a vibration there isn't supposed to be one. If I drop the temp with a huge inhale, will it vibrate when it goes back up to the temp? Just thinking perhaps S&B making little tweaks behind the scenes for battery management. My new Crafty works the same so I assume it's normal.
I don't like the sound of that stuck-on situation! Hope that was a one off for you.
My Mighty, received from S&B America in Oct. 2015, is also a 23xxx. Seems to be a popular range!
All 4 devices I've had have had the vibration feature go intermittent. Sometimes a gentle bump like with the palm of you hand will help it work. It's just a little spinning shaft with a lopsided weight on it, and sometimes these just hang. Often I appreciate the reminder, but often it seems like a lot of beeping...
In my experience, the vibration occurs when
1. the device is powered on or off manually (one beep)
2. the device auto shuts off. (I think one beep, though i forget at the moment!)
3. the device first reaches a temp you have set, if the set temp is higher than the current temp. (two beeps, like the Roadrunner in the cartoon).
As you draw, and as it goes through it's set range (+/- about 2 degrees C) no beeping, unless one of the above has occurred.