Hi,
I just installed my NUC (D54250WYKH) and hooked it up to my A/V receiver (YAMAHA RX-V767) via HDMI. I have the same problem as the user above, the NUC crashes and reboots when when I turn on/off the receiver or when I change input. It never crashes otherwise, only when I switch inputs or power off/on.
Inputs to the receiver are PS3, PS4, desktop PC and NUC. Outputs are older Samsung LCD and a brand new Sony projector. Before the NUC, I had a Mede8er media center hooked up to the same input that worked flawlessly. I have never had this problem with any other device connected to my receiver.
You would likely be able to reproduce this error to be able to update bios/drivers if you put in more time to investigate. I would hate to replace the NUC with the mede8er again considering the 400+ Euro spent.