Raspberry Pi 2 loses ethernet connection

Ever since day 1 with OpenHAB I‘m experiencing random complete disconnects of my Raspi 3B+ (running Docker / OpenHAB) from ethernet (no link anymore) after a couple of days or weeks.

What‘s odd:

  • When this happens, the Raspi seems to be still running fine (headless) but the Ethernet LEDs are completely off (even when I unplug / reconnect the network cable).
  • When this happens, the only thing that helps is a reboot. Afterwards everything is fine again.
  • I changed the Ethernet cable already.
  • I already did a fresh install of everything.
  • Power supply also looks fine though.

Any clues?