first of all there are no problem with the stairs but after 4-5x down and up stairs my char stop walk then i check that lost wp so i try off and on again... my char can walk again... but it mean that i must on and off my char... tq
Hm, maybe you made your waypoints incorrectly. This could happen when you forgot to mark "GOES UP", when stairs goes to the upper level.
No problems for me, so nothing to fix here.
Can you next time check if before relogin and after relogin your z position doesn't change?