I've been having connection issues specifically with this game as well, even when trying out all possible fixes, except using Ethernet since I live in an apartment with shared Internet. Internet speed is still going between 20 - 40 mbps with the game running. It's gotten to the point where I even get disconnected from my PS4 group chat because of this game. At this point, there's no chance of me doing a Raid. I can only hope Bungie fixes the errors.