Lately I've also been see the "press any button to continue watching this channel" message pop up. That's annoying enough while watching live TV, but it makes any kind of unattended recording impossible. Those looking to get around this with a separate recorder (VCR, DVR, PC) are in for a rude surprise, that won't fix it.
I record to a PC connected to an TV output of my 4250HDC and lost the last 5 laps of a close car race. Very frustrating. I chatted with TWC tech support and was ultimately told that they don't support recording to any external devices. (And apparently not to their own DVR boxes either.)
I also had the idea that a simple IR device to simulate a harmless key, say the exit key, on the remote every few minutes would be the workaround. Anybody see something like that?