Acquiring analog voltage and Freq using producer/consumer architecture

Hi

When I acquire voltage and Freq data using PCI6221, I select a producer/consumer architecture with three loops,which are events loop,daq loop and error loop,I put the analog read VI and counter read VI in the same state that in DAQ loop, but when freq sensor runs slowly or stop, the counter VI will wait data to come,which always lead the analog buffer overflow.Anyone knows what should I do if I must use producer/consumer architecture because of the complex controlling need.

Thanks.