I am not sure. If the fridge section is playing up as well it may have something to with the defrost element, but I suggest you contact them before your warranty runs out otherwise they will charge you for replacement and labour.

Oh dear, this is exactly what has happened to ours. Discovered it was not working properly when the bottom draw in the freezer wasn't freezing properly. Fridge on the lowest setting but not as cold as it should be. Ours is 2.5 years old, just out of warranty. Haven't rung FandP yet. Any luck wth getting yours fixed?

I contacted the NSW Dept of Fair Trading by phone and found that under Australian Consumer law, if there is a a major problem with a product, you have a right to ask the retailer for a replacement or refund (see https://www.fairtrading.nsw.gov.au/buying-products-and-services/repairs,-replacements-and-refunds). I contacted the retailer, referred to this advice, and the retailer in turn contacted Fisher & Paykel. A couple of days later, F&P rang me and said that they would send a technician to inspect the fridge and that it would be fixed without charge, even though it was out of warranty. The fridge had to be taken away but I was provided with a spare one while it was being serviced. I now have my fully repaired fridge back, working as it should.
I'd recommend contacting your local state Fair Trading department to seek their advice. Worked well for me, hope you have a similar result.