AX2009 customization starts working after AOS restart

Hi everybody!

There is a customization done in AX2009 working since January 2018, the last month the customization stops working with no error message... nothing, just press the button and it visually seems that nothing is going on with the process. After restarting the AOS, the customization starts working normally. There is no error when compile the project, and it always works fine for long period of days before this behavior. Anyone can share if knows why this behavior and how can be corrected? Or how can I detect where the problem is?

Many thanks in advance