that could be servers related issues. Before even update I had few servers would take forever to load while others were quick. had few crashed but then I got rid of those servers and never had that issue. one of the server would take forever but I just tried 4 days ago after long time and it started to work fast now. so I believe its more server related but you never know.
meaning reset app or box.
to reset app, settings, apps, buzztv5, clear data and clear cache
to reset box, settings, device preferences, about, factory reset
im assuming you have latest update? you said you reconfigured same network meaning your forget network and reconnect? are you on 2.4 or 5G or you have both in one network? try to split and connect on 5G first then 2.4 to see if that helps. try different router if you have avaible or swap to different if it belongs to your ISP.
if nothing works then I would say try factory reset option and see if that helps