Ok so I went up to xur, with my Sunbreakers and my exotic shard, and he had my sunbreakers in one of his "upgrade exotic weapon" slots for the week all highlighted for me, so I thought "Oh good, I can upgrade my sunbreakers, thats great".
Except when I selected it, instead of upgrading my sunbreakers... they are just the same sunbreakers as before. Except now, they have zero experience, so I have lost a week's worth of XP gains, as well as 7 strange coins and an exotic shard and 7000 glimmer....
Umm, what?
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You had already upgraded Sunbreakers but since you upgraded them there isn't the next upgrade level until HoW so all you did was reset the Sunbreakers like if you just got them.