😯 Need Help… My Hotpoint Mistral 50/50 (frost free) keeps freezing up this in turn blocks the air vents to the fridge section and stops it cooling. The door seals seem fine…. After manual defrost it re-freezes up in about 3 days… Any advice… (I have heard you can set it to defrost frost free manually, by switching the lights on and off a number of times or something similar, is this true) THANKS IN ADVANCE…..