Installed in March 20.Makes a lot of noise sounds like rubbing loose part somewhere. Happens randomly, technician could not reproduce. As the time goes by, it is happening more and more, never know when it starts or when it stops, sometimes, it stops after a few minutes.
We changed ours as the previous one was almost 10 yrs old, probably used a lot by previous owners and paint inside chipped and peeling off at several places, we were advised that it cannot be fixed. Now, this has metal lining and gets rusty spots and very hard to clean. 
Convection micro works very well, metal tray is rather expensive, does not come with the oven.  previous oven has lot more interior space than this one.  We had to buy this one due to size specs.