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As I discovered last week, excessive heat can be due to a busy box. I had had my laptop plugged into the network at work, and when I got home forgot to change the DNS entries back, with the result that the laptop fans were going full blast even when I wasn't doing anything.
Which reminds me that a mate was complaining that his wifi router was running extremely hot, and I fixed that by securing it; he lives in a block of flats and others were using it as a free ride.
Maybe the reports of homeplug devices running hot are due to excessive error correction / line noise.