Have you ever experienced situations where, while connecting Xperia and Windows 10, the connection drops or becomes unstable, resulting in files and folders not being displayed or Explorer crashing?
I've been getting a sense of the cause, so I'd like to share the solution.
Solution
I felt that the connection becomes unstable when screens other than the home screen are open during USB connection. In other words, you shouldn't open, browse other apps, or lock the screen while connected.
It's fine to temporarily open an app, but if you perform operations like viewing folder contents in Explorer while an app is open, there's a high probability of crashing.
Summary
Keep the home screen up while USB connected between Xperia and Windows.