Interrupts mode failure for counters on 6624

[toto69]

Hi everyone, 

I'm facing a problem with a counter board PCI-6624.

I have 5 flowmeters inputs in quadrature.

3 of them are in DMA and 2 in Interrupts mode for the edge count DAQmx read function. (6624 doesn't allow more DAM channels, and I cannot use multichannel task for counters)

After a while, we have the interrupts channels freezing and sending the last acquired data, but no error is displayed. The other channels are still working well.

I have tried to change the position of my DMA and Interrupts channels. It is always the Interrupts channels that freeze.

DAQmx v9.8

LV 2010

Do you have any idea or a solution.

Kind regards to all the NI community.