King crash!

Long enough to start (approx 30 s).
I made this acquisition mainly to serve as media distribution gateway content on my PC.
There: he must forget the windows share (too long and often plant)
So: I use the DLNA (installed in Win Media Player) or better yet Tversity (fee).
Access to the media is very long, some videos are planting the bridge but the blow from the way it works?
I tested the same content with my smartphone after having installed a DLNA player and thus on the same network and there, no crashes and good response times.
Sometimes there is a sound lag?
When the services offered; they are not intended mainly for French (eg no Pluzz).
The access to Youtube and Dailymotion videos are discouraging slowness and jerks.
In short I regret a little too expected after my order to test it because I certainly would have returned.
Moreover I note that many users are satisfied, can be am I came across a wrong number?