DAC stuck

Hi I'm using board OMAP L137 EVM 
can someone tell me why my DAC always stuck when I try to do filter calculation in floating point ?
it didn't  stuck when I calculate it in fixed point 

I put the ADC data into bandpass filter and send the calculation result  to DAC .
If I use floating point like float or double for my variable, the DAC stuck, but when I use  fixed point (in this case int), the DAC didn't stuck and my bandpass filter worked good in frequency above 200 Hz

please I need the answer