I had this exact problem with my HDVR2. Tuner 1 is perfectly fine, but Tuner 2 pixellated, occasionally to the point of freezing the unit if left long enough.
There is no known fix. I disabled the second tuner for a while, but I realized how dependent I was on it, so I bought a new DSR708 from Weaknees and "retired" the HDVR2 as a spare unit.
I have seen a couple similar cases here, always with an HDVR2. I wonder if there was some weakness in the second tuner that it showing up as the units near 2 years old...
There is no known fix. I disabled the second tuner for a while, but I realized how dependent I was on it, so I bought a new DSR708 from Weaknees and "retired" the HDVR2 as a spare unit.
I have seen a couple similar cases here, always with an HDVR2. I wonder if there was some weakness in the second tuner that it showing up as the units near 2 years old...