LogitechMediaServer stuttering on Windows 10?

Hi,
after my loved SheevaPlug died last week, I had to buy a new box as LogitechMediaServer and Fileserver and bought a NUC with windows 10 pro.
It has an internal SSD and an external HDD connected via USB 3.0 (for the music files).
I installed a recent LogitechMediaServer (beta).
Everything is fine, but sometimes the LogitechMediaServer is stuttering for some seconds up to a minute, especially when being in the Mediaserver settings (via webinterface).
During this time, the fileserver (network share) seems to run without problems.

What can be the reason?
Anybody else running LogitechMediaServer under Windows 10? Without problems?

Thanks,
Micha