X10 -> sensor problem or humidity problem?

My X10 also has a humidity problem, but of another type...Normally the X10 is kept between shirt and coat when walking and cycling, but now in winter with a heavy coat and excerting myself a bit, the X10 strikes operation with flashing red LED and dark LCD. The damp atmosphere under my coat
seems to be the culprit. After five minutes in the room it is back to normal...

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WillemB