I don't believe this has occurred again since updating to 8.5 2018-12-07, if so it would suggest it was an issue with the previous version (2018-11-28).
This is not the issue of upgrade SERP. But serverip.dat in this case contains the value: 192.168.88.12:1301, so this is local IP of the server with SERP.
Anyway I don't understand what do you me...