It doesn't matter conceptually, but just to make sure - you definitely have V6? If you're not sure, check here . I only ask because you refer to "recently upgrading" - do you mean swapping TiVo boxes for V6? Or have you converted V6 into 360?
Conceptually, recordings don't buffer. They're being played out from the box's hard drive - so I'm assuming there's one of two things happening here.
1: You're seeing picture breakup and/or pixellation. This can either be a poor connection, a signal fault or a hard drive problem, depending on the circumstances in which it's happening. This can be clarified if necessary.
2: You're seeing buffering when you stream recordings made on one box, on your multiroom box. This is entirely possible if the connection between one box and your homehub (which acts as intermediary) is poor, which is also entirely feasible if that connection is wireless. As with scenario 1, there's a few things can be checked if this is the case.
If you can clarify what you think is happening, then further advice & checks can be suggested.
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