I have a problem with my Matrix M-Stage. It usually works good for a while, but then there comes this low trembling noise creeping and eventually overtakes everything. When I press with downward force on my 6.5mm jack I can sometimes make it stop. This makes me believe there is something wrong...

So I plugged in my Schiit Vali 1 and something is wrong with it - the sound is super low quality, lots of noise, crackling, popping, any tracks I play don't have any bass just vocals, etc. Something is wrong with my Vali :( The strange thing is that when I unplug one of the input plugs (either...