Matlab wants activation after it has been activated

I activated my Matlab License. Confirmed by Mathworks. But each time i start Matlab it wanted to be activated again and again. What is wrong?

when run the application apears again and again.

[Walter Roberson]

https://www.mathworks.com/matlabcentral/answers/106141-why-am-i-continuously-prompted-to-activate-when-i-try-to-launch-matlab