Show pauses for a second while viewing

[zip]

I tried posting this at the end of another similar thread, but haven't seen any responses, so I thought I'd start my own.

I have multiple tuners (HDHR, and HVR-1600). I can somewhat understand a slight delay when watching a show as it changes files, creates a new one and moves to the next. The biggest problem I have though, is when watching a 1 hr show on one tuner while recording 30 min shows on another, the 1 hr show has the same "hitch" in the middle when the other show is being tuned, and a new file created for the recording that I'm not currently watching. The 1 hr show is still recording to the single file with no change, and I'm having no resource issues on my HTPC (I've recently upgraded the entire system assuming my aging setup was the cause), so why am I seeing the same problem in this situation? Any ideas would be appreciated.

Thanks,
Zip