RobotStudio event

The tool stop, lift up and fly away... ;o(

Hello
i'm new on this forum, and in robot programmation too (2 weeks). (hope you will be indulgent)
If i'm not in the good place with my newbie's questions or if this forum is not to answer to some people like me, i'm sorry, let me know and i will move away.
My shop baught a 2003 IRB 1400 (i know, not new, but work apparently fine)
I installed Robot studio 6. I watched and read lot of Youtube video and tutos...
i designed a tool, attached it to the head, created targets points and path.
all seem fine, when the tool run the path, target 1-2-3 all is fine and when the tool leave the target 3 to 4,
in robotstudio virtualization, the robot leave the path, and start to move up back whitout logic
But the target 4 seem correct, it's a copy of target 3, just translated on X and Y
and when i start the function ''see tool on target '' , all seems ok.
I activated the green zone around the robot, and all seems ok too, not to near, not to far.
Thanks a lot to all of you who will take time to answer.
Thanks