Freeze with Raspberri Pi2

hello,

I used a Pi1 with Raspbmc without any problem. I upgraded to a Pi2 with OSMC, and each video I play freezes some secondes, then play again normaly until the next freeze. In general, the first freeze occurs after at least one hour of play, but less than one hour and a half.
It seems there is a memory leak ; or something like that. After a certain time, “something” might be full.

I am not overclocked. Videos are on a nas, with 1 Gb ethernet.
The same material , except the Pi, worked well with Raspbmc.

Thanks for help

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