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NI USB 8452 connecting more than 3 SPI TSSOPs

Hello,

I am using a NI 8452 doing read/writes to tssops. One of our modules has 8 tssops. I connected all of them according All devices share the SPI MISO, SPI MOSI,+5v, gnd and SPI CLK signals. Each one is connected to its own chip select (CS0 to CS7).. I can only read back 3 out of the 8. The rest of them give back garbage..  If I connect to each one individually I get back the correct reads I put in...If anyone can shed light on this please let me know.. 

thanks in advance

Joe

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