Noticed this morning that Caller ID wasn't showing up on the TV screen. I checked the settings and it said that Notifications was set to "On". I then looked at the log and saw that no calls had been logged since around 3:30 pm this past Monday. Thought I would go ahead and run system test. Surprisingly it came back with Diagnostic Error Code 21-72-872 and said that an Internal Storage Error had been detected and also that the receiver was not connected to a phone line (which it is). As far as the internal storage error, the message says that it may be a simple initialization error or a critical fault and that I should call Customer Service. Man, I hate having to replace my DVR. It's my original HR20-700 that I've had since January 2007. I like having the built in OTA tuner for rain fade back up and also loosing the recordings that are on it. I may wait until it actually starts showing signs of failing before replacing it.