Chrome:Video interupted by screen saver

[JoMoK]

Chrome 43.0.2357.124 m (64-bit)
Windows 7 64-bit
Chrome built-in flash player only, no others present
Sandboxie 4.18 64-bit

When chrome is run inside sandboxie and I start a video, the video is interrupted by the screen saver. Without Sandboxie, Video plays without screensaver interruption.
This has been the situation since the first 64-bit chrome which was my first install.
This has not been observed in: Internet Explorer 11 64-bit, Waterfox 64-bit or Firefox.
I could watch videos without sandboxie using chrome, but I prefer not to.

Thanks in advance for any responses.