Multiple chart memory

Hi,
I have to acquire 32 signals and display it on 5 differents waveform chart with a sample rate of 100kHz. My problem is when I use 1 waveform my program works, but when I have more one waveform chart, my RAM increase continousily until I have an error of overwritten.
All my chart history lengh is 1024.
Could you help me please?
Thank you very much
Romaric GIBERT

I haven t the VI in version 2010 in  my home. I did some screen shot
Thank you very much
Romaric GIBERT
Attachments:
1.png ‏176 KB
2.png ‏175 KB
3.png ‏177 KB

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