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Buffer overrun while using chart sweep mode

Hello all,
 
I have an application which displays data coming from a self-developed acquisition system. The data is transferred from the acquisition system to the labview program through a protocol using an USB serial port. The labview interface to the serial port is build using VISA vi's. After a package is received, the data is extracted from the protocol and displayed in a chart. Sample frequency is 1000kHz, so 1000 packets per second are received.
 
I use the standard pallette of functions to zoom in on the data and scroll through it. When the chart is in sweep mode, and i first zoom in alot and then zoom out to view the total signal it causes a buffer overrun. If the chart is in strip or scope update mode, there are no problems.
 
Does anybody have an idea about how this is caused and if it can be fixed, without rewriting the entire program?
 
Thanks in advance,
 
Youri
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