+1 to all of this. I'm on Time Warner Cable in upstate NY using Cisco cards and a Cisco STA1520 TA. I had this issue with my 4 tuner Premiere XL4 which was just replaced with a 6 tuner Roamio Pro. Often times tuning a channel will just display a black screen without the "Press SELECT to tune again" message. And, of course, many failed recordings. With the XL4 I found a "fix" which was to go up one channel, back down 3, then back up 2 to the original channel that wouldn't tune, and 9 times out of 10 it would properly tune. With the Pro, that doesn't seem to work (more tuners to "clear out"?), but backing down one channel, pressing Live TV to switch tuners, then typing the original channel number in will tune it 9 times out of 10. My 2 tuner Premiere and 2 tuner Premiere XL both have never had an issue tuning a channel like this. It's only the 4 and 6 tuner setups that do here. This issue (for me at least) isn't tied to the Roamio only. If there's any other info I can provide, I'm happy to help.