My chromecast is plugged in using the supplied adapter so it's on 24/7. After a couple of weeks the picture starts to break up. Every few seconds it just shows a screen of noise. This happens on the chromecast page, the one with pictures and the time, and if I stream stuff. It is fine after unplugging the power and back in again. Is it usual that it needs rebooting every so often or does it sound faulty.