I'm making the textdraw moveable from top to bottom, and sometimes it disappears.

It's supposed to be like this:
 
At first, i'm moving the textdraw by destroying and creating the textdraw, but i found this:
DynamicPlayerTextDrawSetPos(playerid, MoveableElectricTextDraw[playerid][cableID], 421.0, ElectricCablePos[playerid][cableID]);
I thought it will fixed the problem, but nope... it still disappearing.