On Vivaldi systems, this can happen if there is a set-up error in the clocking system, generally either
(1) locking the DAC/Upsampler to the Master clock but not the Transport or other source or
(2) locking the source device to the Master Clock but running the DAC in Master Sync Mode.
The Sync Mode icon on the displays should help you find the error. Please correct the clock connections or the DAC/Upsampler’s Sync Mode settings.