Your newly exchanged SB2 has again throttling issues? Wow this is really bad news. Did you test other stress tests for confirmation? I am at the end of my wits after having spent two days isolating the issue. Not even a clean reset has helped.
I am thinking on skipping the ultra low power CPU notebooks in my next purchase I think. I am wondering what sales support will be offering me when I decline a refurbished device. As far as I can tell, in Switzerland one can ask for a refund in warranty period if the terms of business is not excluding this option for separate cases. The terms are not reserving them so I should be able to ask for a refund. My patient is really running low with MS and I would rather sue them to obliteration than fiddle with their half-baked trash. I lost so many hours and days, I'd rather spent them doing fun things, but MS is not even wise to the fact that SB2 is a throttling mess.
I have this issue too, i'm from Europe (netherlands) an it started happening to me like 1 month ago, i already sent my device to microsoft, i got a new one, but i has the same problem....
For what i've read i think it's a bug somewhere but every time i contact microsoft support they tell me that they didn't know this issue existed...