I've had my Civic since November and get a fog on my rear window in the area of the brake light. Rear defrost does not clear it. If I wipe it away, it will come back in a day or two. Trunk is not wet, no signs of leaks. While it was in for the recall or software update, I had my local Honda service look into it. Of course they found nothing. The service rep said he has the same issue with his 2016 Accord Sport and he has contacted Honda about his and again, no answers. Anyone else have this issue?