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Data Acquisition delay after a certain amount of time

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I have been learning Labview in the past months and all my knowledge have came from this site, thank you all, well this is my problem: 


I did this VI to log a and plot a lot of signals (14) in  real time, the acquisition in the start of the program runs very well, I verified it changing one of the granite heights sensor using my hands and instantly watching the change in the chart but after a certain time(i could not tell, it could be an hour or even half an hour) if I do the same experiment with the sensor that I mentioned before the chart takes several seconds to reflects the actual change so I figured out that after a certain time the data acquisition is suffering a delay. I have tried to reduce the Chart History Length and  turning on/off  the  Synchronous Display option. 

Thanks in advance for your help It will be very appreciated 

 

more info:

Labview 2015 (15.0 32 bits)

I am using a NI cDAQ-9184 to get the data

The sampling frequency is 1hz (1 second)

 

 

here is my VI and the  configuration file also you need to create(or cahnge in the code) this path D:\SHARE\DAQ to log the data there:


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