Ritual of Souls is sometimes unusable when entering arena

[Lelol]

What is the bug?
Ritual of Souls is sometimes unusable when entering arena

What kind of bug is it? (Quest, Class, Spell, PvE)
Spell

How can you reproduce it?
It seems to be random/haven't found cause

Please describe, in detail, what is suppose to occur when this bug happens:
It's not supposed to be usable

Please describe, in detail, what happens when it bugs up, and how it's malfunctioning:
Not sure

Evidence providing proof of bug:
not needed

(quick fix is to let you trade with people of other factions in arena, since right now it is not possible, so I can't manually give them healthstones)

[Itslovelol]

Can't confirm. Please repost this bug with steps to reproduce.