Quoted from sc204:
I think the weather / Humidity is definitely an issue with the original boards. I had issues every single day. A couple of weeks before the new boards were available the problem went away as the weather changed. I would love to think it is gone for ever but nothing changed so I am sure I will have the issue once it gets cold again.
Unfortunately the current method to identify the problem board was also not available at the time so I don't know which one is the first in the chain to have issues
There was mention of a grommet and something else to help prevent resets etc. and improve the grounding. That could be an issue in colder weather with drier air and more static electricity. Maybe check that out?