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This is interesting. Is the reset by the watchdog timer the same as if you would press the reset button?
I build it using a small solar panel and it's working with my NIMH 3.6v 600mah pack. Question: can you overcharge the NIMH battery with this or is this not an issue?
I am using a similar hardware debouncer like on http://hackaday.com/2015/12/09/embed-with-elliot-debounce-your-noisy-buttons-part-i/ But when using this in an interrupt, the interrupt is still called multiple times. Between 1 and 5 times when pressing the switch.
Btw, in my interrupt I only toggle a flag. "flag = !flag" nothing else. And it is still called multiple times using this hardware debouncer.