Repeated F05 Faults on Whirlpool Microwave Oven

We bought a Whirlpool Microwave, Coffee Machine, Oven and ice Machine in 2013. We were very pleased with our purchase as it completed the modern d?cor in our newly built home. Since then the 6th Sense Microwave Oven AMW 848 has given us annual problems starting at the end of 2013 with an F05 error and then again end of 2014 both of which were fixed under warranty. Unfortunately the F05 error returned end of 2015 this time we were out of warranty and we had to pay a R400 call out fee. My issue is that this microwave has been problematic from the start and each time it has been repaired it only lasts 1 year. The big shock came when we received the invoice of R3659. This is for a microwave that has been faulty from the start and has been \fixed\" twice. I am seriously unimpressed that a product of this quality is on the market and that the costs for repair of a repeated fault must be borne by the customer. We are currently building a second home and would have preferred to consider Whirlpool appliances, unfortunately our experiences with the microwave have left a negative impression and we would appreciate it if you could please look into this.I look forward to hearing from you"