\OpenHAB2\conf\services cannot be saved because locked by OpenHAB

I played around with the file weather.cfg which is stored in C:\OpenHAB2\conf\services. Very often it happened, that I cannot save the changed file because the file is locked by someone else. Only shutdown and restart of OpenHAB2 fixes it

I use OpenHAB2 Beta 5 on Windows.
I edit the file with notepad.