The same problem I have found; and contact with agent, they said that's abnormal. I also had exchanged a new one from Fortress, but the problem still found. The problem may been solved by trying to replaced with the 英國13A 泠涷Fuses
My 1600 have display and noise problem and also had exchanged a new one from agent but the noise prolem still found. Are you trying to replaced with 英國13A 泠涷Fuses to solve the probem? I have oreder the fuses from U.K. in last week and try later!