When printer is switched on it freezes after a few seconds and has to be unplugged to switch off. When plugged in again after a few minutes the same thing happens. I have tried it connected and not connected to the computer - same happens. I have tried a new USB lead - same. I have even tried a different mains lead - same. The supplier, John Lewis PLC told me I had to contact you, they deny responsibility despite the Sale of Goods act.