Samsung American Style Fridge/Freezer RSG5UUBP problem

My Samsung American style fridge freezer ice maker is making ice ok, but ice dispenser flap just wont open whether set on cubed or crushed ice. Can hear motor etc when press receptacle up to switch, but flap simply won’t open. Can open flap manually though so it’s not seized up. The water dispenser is working fine. Other oddity is when I open freezer door, the display panel always shows temperature etc until door opened more than about 45 degrees & then display goes blank & ice dispenser makes loud clicking noise (..even though set on Water dispense). Would a faulty freezer door switch cause ice dispenser flap not to open, or is it some other problem? The Samsung model number is RSG5UUBP. On rare occasions too when I open freezer door past halfway get pinging alarm & error message ‘PC Er’ on display screen. When open fridge door & then shut the freezer door before re-closing the fridge door, the display comes back on again. So I’m also beginning to think it may be a dodgy display control panel rather than the freezer door switch? Doing my head in, so any help/advice much appreciated!