I diagnosed a bad hard drive via the Kickstart diagnostics. All of the tests but the first were coming back with "Fail 7" codes. The symptoms were inability to stream from the Roamio to the mini, mini disconnects, stuttering on playback of recorded shows, and reboots on the Roamio. Basically the only thing working properly was live TV on the Roamio. I contacted Tivo Support with the symptoms and they diagnosed it as a network problem -- ie not their issue. I had Charter come out and replace the line drop to the house. I replaced the network switch and router and the problem still continued. After learning of the kickstart codes, I figured out that the problem was the hard drive so replaced it with a new 3TB drive. The problems immediately disappeared and all was well with Tivo. I relay all of this to Tivo support and request a replacement hard drive since the system is still under a 1-year limited-warranty and they tell me that replacing the hard drive just invalidated that warranty they won't replace the broken hard drive. Really??? I expected if an original part failed that they would replace it. The thing is only 6 mo's old and I purchased it directly from Tivo. If something else goes wrong with the unit within warranty, they won't replace it? One of the original reasons I went with the Roamio Pro was that I wouldn't have to upgrade the Hard Drive and I end up having to do so anyway. I think it was probably still worth replacing the hard drive myself if the alternative was having to send the unit in for replacement but I'm really concerned now about what happens if something else breaks that isn't user replaceable.