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Moisture should not affect it, if it does, something is wrong. I'm guessing (and that is all it is), it was a coincidence. If it happens again, cycle through the buttons about 30 times. Hit all the buttons while sitting still, locking the t/case in and out of 4 normal, 4-HI and 4-LO. Sounds crazy, but it has been known to actually work. This was an actual correction requested by Borg Warner for the transfer case control module.