My Matrix Mini i pro DAC sort of died recently. It's been on and off with powering on, and my temporary solution was to wiggle the power cord at the back. Lately, it's been harder and harder to turn it on with that method, and it just decides to cut in and out whenever. I suspect it may be the capacitors inside. With problems like these, is it worth attempting a repair at a store, or should I just buy a new one?