Hi Cobain86,
I had similar but not identical issues with my Alchemist. I carefully pulled the chassis out and reseated all connectors in the audio path and made sure all power supply connections were tight. There are a lot of internal connectors in this amp and they are all places where oxidation can cause problems. By reseating I mean I unplugged and replugged every connection 3times in an effort to scuff the oxide off the connections. I was very careful not to bend or break pins in the process. Also a product like Caig Deoxit used sparingly on the connection will help as well. It helped my issue immensely.
