Rpietila do you not have a humidor? i could recommend one which i use myself - until i started storing my cigars this way i thought they were not worth using - but the difference smoking one at optimum moisture levels enhances the flavours considerably.
Finnish winter's relative humidity is quite low inside the house. I probably overloaded the humidor with water which means that some of it had dripped from the moisturising part to the cigar in question. The wrapper was actually damp. I thought that "nice, at last the humidity is high enough", but seems that I overdone it. Thank you and the ones with PM answers.