I have 2 HR20-700 HD DVR's. One is hooked up to an 500 GB Seagate esata external hard drive, the other is hooked up to a 750GB Seagate esata external hard drive. The one with the 750 GB is resetting to the internal hard drive at least once a day. The one with the 500GB hard drive has worked flawless. no problems. Any suggestions? There have been no power outages or any thing of that nature.