Logs spammed by address changes while it did not happen

Looking at my notices logs on 0.4.5.1-alpha , they are spammed by this:

Nov 07 22:17:06.000 [notice] Our IP Address has changed from 212.47.236.95 to ???; rebuilding descriptor (source: METHOD=NONE).
Nov 07 22:17:23.000 [notice] Self-testing indicates your ORPort 212.47.236.95:443 is reachable from the outside. Excellent.

My relay is a VPS hosted behind a NAT.

$ uname -a
Linux hermoth.oudin.red 4.19.53-mainline-rev1 #1 SMP Wed Jun 19 23:30:45 UTC 2019 x86_64 GNU/Linux

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