Minor jumps and pixellation if viewing while recording

Just curious if anyone has had problems if they try to view a program at the same time it is being recorded? I was recording a program last night, and started watching about 5 minutes after it started so I viewed the recorded episode. About once every thirty seconds or so the audio would skip a word of dialog, and the image would pixellate slightly for a few frames. After that it would be normal until the next 30 seconds had passed.

I stopped watching the recording and switched to live-view during one of the commercials, and there were no problems at all watching the live broadcast.

Could this be a problem with disk access speed? I’m using a Western Digital Passport 2TB drive…

Thanks…