You're probably due another new screen soon anyway if it's been more than a couple of months since the last one..!
I know what you mean, I wince every time I heat the TIK of something hitting it.
It was serviced on Monday, they've checked it and it's all OK. However, there is a service bulletin from Mazda that says the camera window can "under certain circumstances and weather conditions" mist up. In other words, sh1t happens, you have to live with it. It's not a huge issue, I just wish that, when it happens, it would switch the headlight off main beam automatically as you don't see the warning message if you're concentrating on the road.
Alan