I'm using the camera board as a weather cam. A cronjob runs a script every 15 minutes to take a picture and upload it to WeatherUnderground. This job has been running for months without any problems. Two days ago I noticed that increasingly larger parts at the bottom of the pictures were "grayed out".
A reboot solved the problem. I use raspistill to take the picture, imagemagick to do some post-processing (crop / resize / annotate) and ftp to upload the pictures. Could a memory leak be the problem?