The Ultimate Guide to LG BU40N 1.00 Firmware : Why Older is Sometimes "Hotter"
Later firmware versions (1.01, 1.02, 1.03MK) can be cross-flashed to a "patched" version that:
Vulnerability & malware scanning
The nuclear option: hot-glue a to the outside of your USB enclosure, powered via USB. This reduces operating temperature from 65°C to 38°C.
The search is up 300% year-over-year because physical media collectors are returning to discs as streaming services delete content. If you want to archive your 4K collection, dealing with a warm drive is a small price to pay.