Never mind the LAN7515 heatsink. The issue was avoided by some combination of 
other missing configuration (I have since managed to trigger the issue):
- iptables-rules not loaded
- dnsmasq not running

Sometimes (in the full HE.net tunnel + v6 gateway configuration), the
problem is triggered by an IPv4 download, even.

I'll keep tracking this down.

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https://bugs.launchpad.net/bugs/1861936

Title:
  Raspberry Pi 3 network dies shortly after a burst of SD card IO and
  network load ((lan78xx): transmit queue 0 timed out)

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