As the temperatures climb here in Arizona, I've noticed that the video captured by a hot camera becomes severely front-focused and that it takes a good 5-10 minutes of cool-down in air-conditioning or out of sunlight for the main camera before focus returns toward infinity. The back camera seems unaffected.
Is this a characteristic of the DR650 series cameras? I've noticed spontaneous reboots when the camera is hot as well.
Here's a still example of parking mode after sitting in the sun for about 2 hours. The dash is sharp, but the cars in the distances are not. Normally, the distant objects are more in focus.