fault

I've got an ex-dem Leema Libra DAC connected to a Hydra II Anniversary Edition power amp [on loan]. The DAC turns the volume down by itself within ten minutes of switching on. However, the displayed volume level does not change. Does anyone know what is going wrong? It's connected to the amp via...

A problem has reared it's head in my system, whereby after a period of inactivity (say 24 hours), I turn the system on and start to play either music or TV, and the sound is louder in one channel. The sound doesn't completely disappear from the quieter channel, but it is a very noticeable drop...