Tuners are normally hot.
About the box temperature, if it remains high also when there are apparently no intensive activities, you should check the fan settings.
As you can see there is a fan mounted at the back. It is not a noisy fan so should not be a problem and the fan has an automatic temperature sensor based FAN speed control so it will not make more noise than needed to keep things cool.
You only have to worry if the fan works normally!.
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