In January 2024 I purchased a Maxify GX6050 printer. Fortunately it had an extended 3 year warranty. In July 2024 the printer stopped printing in Duplex mode and I put in a warranty claim and eventually the printer was replaced under warranty with a new one. So 4 stars for customer services and the warranty claim. Five months later and the replacement printer has EXACTLY the same fault. We can print single sided with no problem at all. When we ask the printer to print anything duplex it usually prints the first page duplex but then stops after the first side of the second page and says the paper size is wrong. We have always use HP paper. It is always A4. The same as the first printer the duplex printing works well for about 6 months and then stops printing duplex. We have not had any paper jams. We have checked the printer, there are no dirty rollers that we can see when we remove the back cover and he printer works well with single sided printing - even if we ask it to print 20 copies of something. This is a fault with duplexing. I have 2 Canon PIXMA G7050 printers that are 2 or 3 years old and I have never had a problem with duplex printing - which we do a lot of. We use the same paper in every printer and never have any problems with any other printer than the Maxify GX6050.