一段时间后，ContextMenu Excel 365操作丢失了

I've created a contextMenu (CommandBarButton) in an excel ribbon addin written in C# some time ago. I notice that for some reason after a while working in excel the functionality behind the button is lost. Immediately after initialization of the addin where the buttons are added to the context menu it works like a charm but then after being busy in the Excel sheet the function behind the event is not called anymore when I click on it.I've created a contextMenu (CommandBarButton) i