Since yesterday, I noticed a problem with the system that determines that the character has left the battle.
I went through several LFR raids, but as I used the Warlock health stone in the first battle, I couldn’t use it even when re-entering a new raid.
Today I trained on another character, already in the city and also couldn’t get out of the fight. Moreover, using the stone of return does not solve this problem, I am also in battle.
Removing a significant distance also does not solve the problem.
The problem is solved only by exiting the game and re-entering.