I assume you've checked it's not still in maintenance mode? That is the usual reason for jerky live TV and playback.
I just set up a TiVo that was extremely jerky, and in the menus it was not very responsive. Even the background animation kept pausing! I tried another hdd and it worked perfectly smoothly. Sadly it didn't fix the green line issue the TiVo also has, but that has another cause...
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