Audio lag/not smooth

I have an MKV file on my computer and it works perfekt in vlc, kmp and wm player. But when I play it (local) on my Boxee Box the sound is not running smooth. It is not getting out of sync but it kind of lags.
Media Info says:
Video
ID : 1
Format : AVC
Format/Info : Advanced Video Codec
Format profile : High@L4.1
Format settings, CABAC : Yes
Format settings, ReFrames : 3 frames
Codec ID : V_MPEG4/ISO/AVC
Duration : 1h 38mn
Bit rate : 4 825 Kbps
Width : 1 280 pixels
Height : 544 pixels
Display aspect ratio : 2.35:1
Frame rate : 23.976 fps
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.289
Stream size : 3.24 GiB (74%)
Title : Hero
Writing library : x264 core 61 r957M 7ce0f2c
Encoding settings : cabac=1 / ref=3 / deblock=1:-3:-3 / analyse=0x3:0x113 / me=umh / subme=7 / psy_rd=0.6:0.6 / brdo=1 / mixed_ref=1 / me_range=32 / chroma_me=1 / trellis=1 / 8x8dct=1 / cqm=2 / deadzone=6,4 / chroma_qp_offset=-8 / threads=6 / nr=0 / decimate=1 / mbaff=0 / bframes=3 / b_pyramid=1 / b_adapt=1 / b_bias=0 / direct=3 / wpredb=1 / bime=1 / keyint=250 / keyint_min=25 / scenecut=40(pre) / rc=2pass / bitrate=4825 / ratetol=1.0 / qcomp=1.00 / qpmin=10 / qpmax=51 / qpstep=4 / cplxblur=20.0 / qblur=0.5 / ip_ratio=1.40 / pb_ratio=1.30 / aq=2:0.50 / zones=134000,141933,b=0.3
Language : Chinese
Default : Yes
Forced : No

Audio
ID : 2
Format : DTS
Format/Info : Digital Theater Systems
Codec ID : A_DTS
Duration : 1h 38mn
Bit rate mode : Constant
Bit rate : 1 510 Kbps
Channel(s) : 6 channels
Channel positions : Front: L C R, Side: L R, LFE
Sampling rate : 48.0 KHz
Bit depth : 16 bits
Compression mode : Lossy
Delay relative to video : 22ms
Stream size : 1.04 GiB (24%)
Title : Chinese
Language : Chinese
Default : Yes
Forced : No

I have had no other problem like this before.
I hope that you can help me.