Anyone had toslink problems with sangean hdt1x?

Anyone had cutting in/out problems with the sangean toslink connection to dac? I have a 500 series meridian dac/pre, & the dac fluctuates (only with the sangean via toslink, not with other sources), but if used as just a preamplifier it does not cut in & out

thank you
I have never had any problems running into a Cambridge Ausio DACMagic.
thank you. it was a faulty sangean, no problems once the tuner was replaced