Green screen, blurred camera, looksnlike an old VHS tape

Several of my clients and one of my teacher has had numerous issues with their cameras. The screen will randomly turn entirely green, or it will blurr completely or get snowed over like an old damaged VHS tape. The only fix that seems to work, albeit temporarily, is to turn the camera on and off. This isn't a hardware issue as it has happened to a variety of my clients all with different hardware and operating systems. Attached is a screenshot illustrating a mild form of the problem. 

Any help would greatly ve appreciated.