I submitted a potential issue to Topping about the DX5 II auto-detecting the input even though it is set to manual in the "Input option" menu. Because of how I have to have things set up, my USB DDC (a D10s DAC in "bridge mode") is the primary audio device, but I also need to have a USB connection to the DX5 II in order to update FW (and use Topping Tune). I only have OPT and USB checked in the Input option menu, and when the system wakes up after is goes to sleep, the DX5 II will switch to USB even though OPT was chosen prior to everything going into standby mode. On/Off trigger setting in the Advanced settings menu is "Signal"
I get why it does it, but since auto-detect isn't selected, it should only switch inputs unless the end user chooses to do so when "Manual" is chosen in the settings. I have also seen it set itself to COAX even though that is not even an option I have enabled in the Input option settings.