I doubt that rebooting the infotainment is a permanent fix for this particular issue. I have the April update and I've also experienced the camera not available message, but only one time. Toggling the camera icon brought it right back on. I suspect that this will eventually need to be fixed in a future firmware update where they wait a few more milliseconds before giving up. Maybe our cameras are slightly lazier in responding, but I don't think that they are defective.