I'm sorry for making you feel ignored, but I'm not sure how to debug a problem like this without being able to reproduce it myself. One thing that would probably help is if you could get a stacktrace of the client while it's running. VisualVM is one tool for doing that.
Also, I assume that you, by "Windows 9", in fact mean Windows 10. I have heard other reports about graphics bugs on Windows 10, and while I don't use Windows myself and thus don't know all the details, I'm aware that Microsoft has completely redesigned the graphics stack in Windows 10, and that the video card manufacturers have thus had to rewrite their drivers as well. I hear on the rumor mill that some of those drivers are still sub-par, so I wouldn't be all to surprised if it's related to that.