The Dark Stalker passive includes a speed bonus to stealth movement. It works at first, but if you die and respawn then the speed bonus stops working and you're back to normal stealth speed. Doesn't matter if you respawn via wayshrine or soul gem.
Only way to solve it is by relogging, only for it to be broken again if you die.
Hoping for a quick fix, this passive makes being a vampire worth it in Cyrodiil, but right now causes too much frustration.
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