Volvo V60 interior squeak driving me crazy!

I'm seriously thinking of trading in my Volvo V60 after only 6 months - and ditching Volvo. Love the car but I've never had a vehicle with interior noises like this. This is my second V60 and both have had annoying interior squeaks. Never had any issues with Ford or VW. The squeak is coming from around the rear seating area - I've driven with seats up and down and spent hours trying to replicate the noise - buts it intermittent. Seems to be worse when the car is cold. Any advice appreciated.