Hi we are having trouble entering sanguine depths. On the first pack pull we all DC. We are then removed from the dungeon and the key is lowered as a result (we lost a 16 key in the process). We notice lots of other players trying to enter the dungeon. We tried a lower key (an 11) but had the same result. Not sure what is going on with this Instance.
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We were killing the last boss in SD +13 and suddenly we all DCed. 2 mins later, we are all ported at start and key is gone. GG Blizz, quality game 
We were trying to get in SD to start a new key, get error “instance not found”.
Managed to start the key now but we are experience a massive server lag spike on the first pull… Really “quality” game, Blizzard.
Same, almost done with instance for weekly vault and it kicked us out. EU. Also Sanguine Depths.
Same thing just happened to us. SD 4, 3% left on last boss, whole group dced, put back to the start. Tried it again other on the lowered key, same thing happened after 3rd boss. Quality game…wasted the better half of an hour tonight on this.
Tried another SD +13. During the first pack of mobs we get this massive lag, game becomes unplayable. Ported out 
Quality at its finest.