Preface: today was the second time this happened. Low 30s overnight, car in an unheated garage, mid-50s during the day. I preheated the car with max heat/max defrost for about 10 minutes, then switched to my normal 68F and drove off. After some 10 minutes of driving, an alert comes up: blind spot detection limited. Last time this happened, one of the b-pillar forward-looking cameras has condensation on the inside of the glass that covers it, so I pulled over and got out to take a look. Sure enough, both cameras were fogged up. When I was in for unrelated service a few weeks ago, I mentioned the first time this happened to the techs. They said this isn’t normal and asked me to make an appointment if it happens again, so I did that and have mobile service coming out in a couple of days (holy cow is mobile service availability better in my parts now - the wait used to be at least couple of weeks!). However, I’m curious if anyone else in a similar climate has this issue regularly. Since it’s both cameras, I don’t think it’s an issue with the seal around them, so I wonder if this is going to be a normal occurrence on days with significant temperature swings. p.s. it’s a bit hard to see in the photos since the glass is very reflective.