This microfreak is about 5 months old and the keyboard was hardly used. I have recieved it from a friend and I have the problem that every now and then, keys will get stuck and the note will ring on, sometimes for a fraction of a second, sometimes even for multiple seconds. It happens often enough that it really annoys me. It seems that during a session it's always the same few keys that are most likely becoming stuck, but the "vulnerable" keys change between sessions.
I don't think I have grounding issues, tried with the power supply, with an usb power supply, with a powerbank, with different sockets throughout the house, problem remains. I don't exactly have dripping wet hands either. The air, I would say is rather dry since it's winter/heating season here. What might be the problem, what else could I try?