Fridge smells. We have a Bosch fridge-freezer which about 1 month ago started to make certain

Question

We have a Bosch fridge-freezer which about 1 month ago started to make certain products (ie food stored inside it) smell and taste peculiar. The products are well within their sell-by dates and there is no other mouldy food inside the fridge. We are concerned the appliance is faulty and could be leaking something - could anyone advise?ThanksLeon