I own two Tivo 45 hr Premiere 2 tuners. I upgraded the hard drive of my first Premiere purchased in May 2010 to expand my recording capacity. My second Tivo Premiere I purchased in April 2012 and I have not upgraded.
The problem I experienced recently is using Netflix streaming on my May 2010 Premiere. Netflix seems to stutter at times and audio and video cut out periodically throughout a 1 hr show. If I stream from my April 2012 Premiere, I experience none of these issues. Both are hard-wired with gig Ethernet.
That brings me to my question: is there a hardware difference in Premieres manufactured about 2 years apart? In general, the newer Premiere seems zippier using menus, etc.