I have a Constantine+ DAC connected over optical to a computer, with a WooAudio WA6 amp that I got as a pair from a friend. It's been working fine for about a year now, but recently it has developed an issue where, at some random interval of being on (though not necessarily in use, but somewhere between 15 minutes and an hour), the left channel will begin to decrease in volume. Usually I notice this after starting the music back up, though lately it's been happening while I've been listening. The way I've found to remedy this quickly is to flip the power off on the DAC and flip it back on. It'll be fine for some time until it happens again.
I opened up the Constantine to see if I could spot a bulging capacitor (at least one obvious issue that would be visible) but there wasn't one that I could see. I'm somewhat handy with electronics (though it has been some time since the last circuits class), so swapping out parts would not be difficult.
Has anyone experienced this kind of issue before with this particular DAC? Does anyone have any suggestions as to some diagnostics I might attempt?