Why is it after a year of running this game, the server situation is still abysmal? Add some more hardware or virtual machines, or both. Get better server management and monitoring software. Oh, and send error codes that mean something to the end user.
Oh and those silly solutions that you offer: "Try clearing your cache" "Reset your router"
Uh, no. I pop your game in, Bungie, and I can't sign in. I jump over to Halo 5 and have no problems. Then I run the Need for Speed Demo.... again no problems. Pop in Titanfall, and hey guess what? It works. I sign into my wife's Xbox and have issues with Destiny, but none of her other junk.
It's your crap that's broken.
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Probably because Titan fall has dedicated servers(not sure if that's true). Destiny has p2p (you should look what it is and why it would cause connection problems) which relies on players connection. mainly if your fire team leader internet sux then you will be affected.