Transport sends subscribe-Presence that can be denied
Spectrum2 sends Subscribe Presence for transport that can be denied, if you do, you obviously disconnect again. If you want to use Spectrum, you obviously don't need the choice to do that.
Spectrum2 should send this via Remote-Roster Push not subscribe-Presence
So it is a "Won't Fix" resolution. Closing all resolved issues for GoJara
Fixed in the latest Versions of Spectrum2. If you still see this, you need update Spectrum2.