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Heat circulation issues can be intensified by placing your Blu-ray player in an enclosed cabinet or alongside other devices, piles of Blu-ray discs or even ornaments.
Make sure your Blu-ray player has its own space on a dedicated shelf (preferably with an anti-static surface) of your home theatre and aim to keep this clean and dust free.
If you find that this doesn’t help, you can also try raising your Blu-ray player off the shelf. A collection of small copper coins – perhaps 4 in each corner and another 4 in the middle – should act both as heat conductors and elevate the Blu-ray player to allow better airflow. Similarly, pieces from a draughts board could be used.
A dedicated shelf may not be possible, or your Blu-ray player is housed in a dedicated cabinet. If this is the case you should consider removing the back of the cabinet or improving airflow with a series of drilled holes. Of course this may not be practical in many cases.
Finally, try positioning your Blu-ray player away from heat sources and try cooling the device with a fan.