Apologies it this has been discussed previously, could not find anything similar. I have an HR34-700 and using a 2 TB external HDD, software X870. Every few weeks I will turn on the TV and have picture but no audio. If I disable DD in audio settings there will be an extremely, extremely loud high pitched tone, but no audio again when DD is again chosen. This happened with previous software version but seems to be happening more often after the new software. Only a reboot will get the audio back. Tech support was clueless. I have turned off power saving mode to see if this makes any difference. Has anyone else experienced this, and if so is there a fix?