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Continuous acquisition problem with M series card

I am running an application with 11 analog and one digital channel. The scanrate is 1000Hz and the buffer size is 40 scans, and I have set the system to run continuously. Thus in the callbacks I do an EndReadMulti.. and then a BeginReadMulti... and then do the processing which simply consists of writing to a file.

The system runs for 8 hrs 45 minutes (31,500,000 mSecs)and then stops with error messages from both callbacks:
"A system call returned an error. The operation could not be completed as specified"

Is there some DAQmx variable that is being incremented and then overflows, or is it that buffer memory is not reused and I have to specfically arrange for it to be released somehow.

Any advice would be apprec
iated.

Ray
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