To test if this is caused by the add-on suggestion service (mDNS and/or UPnP), you can add the following lines to the the cfg/services/addons.cfg file before starting OH:
suggestionFinderMdns = false
suggestionFinderUpnp = false
The suggestion finder service will not start and use these underlying services in that case. So if they were not used by any of your add-ons before, they will not be started at all.
The same options are available from the UI, but setting it in the addons.cfg file allows you to avoid starting it at all.