I thought I was the only having this issue. I had done the same steps, my internet provided aslo double checked everything and nothing was wrong. I calles Xbox and they helped me reset my Xbox and I even have a open nat and still encounter this error daily. It started like two weeks ago and I'm afraid about to get banned for getting kicked out too much. I can't play gambit or crucible due to this stupid -blam!- errors.
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Yeah its super frustrating especially when it comes to playing any endgame content because it can happen within 5 minutes of loading in or in a couple hours. As soon as the contacting destiny servers pops up your screwed. Hopefully there is a fix or better instructions to fix the error codes.