Whirlpool 6th sense 20RI-D3L model no (858644515010)

Hi, hope somebody can help? My fridge freezer as above is behaving oddly, the ice maker randomly starts to make ice and does not stop until
turned off manually and also the temperatures showing on the control panel alter from the expected figures to 27 and 2. Last month the whole lot stopped working
while we were away on holiday, no lights on the display at all so I replaced the rear circuit board and all seemed well until last night.
Can anybody help?
Regards Tim