I think this is the same problem as is discussed on OF still close its open window on the top of the hour!. If so, Sonoma 14.1 will fix it. The beta for 14.1 is available, if you want to try that.
To get a window back, right click OF in the dock and choose the window or use OF’s Windows menu. If you create a new window instead, the next time you re-start OF (or reboot), you will have a lot of windows.
