As for your question, "Is the transport sending more information to the M.F. Tri-Vista 21 DAC than the DAC can process?", the answer is no. This is because the only information that the DAC is sending is that which is encoded on the CD. As long as the DAC is able to lock on to the signal it receives from the transport, it will get all the data. You can see the TriVista's lock LED go on when it locks on to the signal. Perhaps it is losing sync lock when the music drops out. This would be a problem with your transport, or maybe a loose cable connection.
A digital transport can never send more information than what is encoded on the disc. If it did, there would be a name for this extra data: distortion.
My guess is that since the only component you replaced is the transport, and your sound has since suffered, it is the Stello transport that is causing the bad sound. either a) the Theta Basic II is a superior transport, or b) your sample of the Stello is defective.
A digital transport can never send more information than what is encoded on the disc. If it did, there would be a name for this extra data: distortion.
My guess is that since the only component you replaced is the transport, and your sound has since suffered, it is the Stello transport that is causing the bad sound. either a) the Theta Basic II is a superior transport, or b) your sample of the Stello is defective.