Your AVR-X2300W will continue to deliver excellent Dolby Atmos and DTS:X sound without becoming a space heater.
A major "hot" update released around September 2017 brought compatibility for Dolby Vision and Hybrid Log-Gamma (HLG) . This allowed the receiver to pass through high-end HDR signals from modern 4K Blu-ray players and streaming devices to compatible TVs.
All AV receivers produce heat—that’s normal. But in the context of this issue means: