Volumio default setting (in Raspberry) is to use the cpu in “performance” mode, so it runs at max speed all the time, playing music or not (and runs hot).
This is made by the designers to prevent any delay or problems in playing music.
The option is to use the cpu in “ondemand” mode, so if the device isnt playing anything, the cpu runs slower and the temperature goes down.
I’m using it this way in Rpi 4 without issues, at aprox 60 C or lower.
Here’s a tip:
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