I have the exact same errors as you. I can't enjoy the game when I have to wait 10 minutes every time I want to go back to Tower. And its not only the tower, I also can't join anyones fireteams or complete online levels without being disconnected from the errors. Its sad and makes me not able to enjoy the game to its full potential. I really wish I could just finish one Raid. Thats all I want. Please fix this Bungie. I didn't spend all that money to be bored of your game.