H.264 web video loses audio sync and freezes frame in JW media player

Hi,
I am trying to put my H-264 video (.mov) that I compress with Compressor on the web to play in JW media player. The problem is, after 30 seconds of smoothly playing, the video starts to lag, freezes frames and ever since then the audio do not sync with the video anymore (can be as far apart as 10 second). Strangely, this only happens on the longer videos.
I am assuming it has something to do with the compression setting that makes the file is too big and thus create streaming bottlenecking? Maybe I should readjust my parameters?
this is the setting I use:
File Extension: mp4
Estimated file size: 104.3 MB
Audio Encoder
AAC, Mono, 44.100 kHz
Video Encoder
Format: QT
Width: 480
Height: 270
Pixel aspect ratio: Square
Crop: None
Padding: None
Frame rate: (100% of source)
Selected: 29.97
Frame Controls: Automatically selected: Off
Codec Type: H.264
Multi-pass: On, frame reorder: On
Pixel depth: 24
Spatial quality: 75
Min. Spatial quality: 25
Key frame interval: 24
Temporal quality: 50
Min. temporal quality: 25
Average data rate: 0.819 (Mbps)
Thanks,
JD

Thanks for the input. What do you mean by encoding it as H.264 not mp4 - which setting affects that?
Maybe I already has it?
here is what I have now:
Video compression setting
Compression type: H.264
Frame rate: current fps
Key frames: every 24 frames
Frame Reordering: Yes
Compressor quality: High
Encoding: Best Quality (Multi-pass)
Data rate: Restrict to 800 kbits/sec
Optimized for: Download
Sound
Format: AAC
Channels: mono
Rate: 44.1 kHz
Show advanced setting: yes
Render setting:
- quality: normal
MPEG 4 AAC LC Encoder Settings:
- Encoding stratey: Average bit rate
- Target bit rate: 96 kbps
Inspector panel
File format: Quicktime Movie
Extension: mp4
Allow job segmenting: yes
Video setting: Enabled
Audio setting: enabled
Streaming: none

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H.264 web video loses audio sync and freezes frame in JW media player

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