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I've got a Garmin Forerunner 405 and have had it for around 5 years without any major issues.
I went for a run today and noticed the screen had misted / fogged up to the point that it was hard to read the display. The watch worked ok and the screen has since cleared.
Has anyone experienced this before with this watch? If so, is the beginning of the end - moisture inside the watch doesn't seem like a good thing to me?!