Reply to Mixer getting too hot?

Today i stumbled upon something i never really noticed. My dj mixer (Reloop Blackfire) was pretty hot. Obviously all electronic gear tend to get hot, but i got myself believeing, how hot is too hot for a mixer?

Just to give an idea, if i put my hand under the mixer, its hot enough to burn my hand if i leave it there for about 5/10 secs. Room temp is about 24