I rent my TiVo through my cable provider and I just received a letter that it needs to be replaced as it is susceptible to a hard drive failure. Anyone out there familiar with this issue? My MG2 has been mostly trouble free, though occasionally when I'm cycling through tuners, I'll run into one with a blank screen and no activity. Rebooting the box always clears up the issue. I'm wondering if this is caused by a failing hard drive.