I've got two 612s and a 722. Both the 612s are rebooting over and over about every two minutes. The HDTV blue light and the green power light come on and there is the loud hard drive spinning up noise. This lasts for about 30 seconds to a minute and then it stops. It only does this when the units are powered off and on standby and not recording. I'll be calling DISH in the morning, but wanted to know what you all thought.