I have the same issue. My receiver X1500 . A few months back all of a sudden all the modules related to network stopped working. I was not so sure it happened few days after some update through the heos app. Sound and video was working for 2 months. Then in December, everything stopped working.No audio and video. Nothing was working. Tried all the restore options but to no avail. Decided to take to profx, in mid December. They said it will take 2-3 weeks just to diagnose and also service charge of Rs.1000 in case it is not serviceable. Extactly on the last day of the 3rd week, got a call from them saying hdmi board and wifi module has gone bad and it cannot be serviced, since they can't get the required parts. I was hoping it to be fixed, but dejected after paying ₹1000. After getting back the receiver, it was shutting off on its own after 30 seconds, and gave the error message please check the network connection, and error 0101 and update error 2A02. After all this , stumbled up on this thread and got the firmware from sound United. But even that is not fruitful. Now, just after 3 years the receiver has to be trashed. I had another Denon from my brother that was bought 16 years back and is working flawless.