Hope that this helps someone, but I was able to temporarily fix this problem by doing a factory reset. It will set the firmware back to the original that came on the unit. Steps that I took.
- Disabled automatic firmware updates by going into Firmware > Auto-Update and setting Auto-Update to Off
- Went into settings and performed a “Save” in the General > Save & Load menu. You need a USB drive and it will save your configuration, including all sound and network settings.
- Unplugged the USB drive
- Performed a factory reset. My model’s reset instructions were here, but you could just google your model: http://manuals.denon.com/AVRX1500H/NA/EN/GFNFSYvyalrwrt.php
- Loaded the settings after plugging the USB drive back into the unit. Again it’s in General > Save & Load. Load was successful and the unit reboot
- Upon reboot I was able to access my AVR from Home Assistant again