Instruments stops recording

I am using Instruments to record some memory, CPU, disk and network stats over 30 minutes.

For some reason Instruments stops recording data after around 5 minutes, does anyone know why this is?

I see the graphs and process information suddenly stop but the capture continues with no error message.

Any help would be much appreciated.

 

I am using Instruments 4.6 and OSX 10.8.2 on a Mac Mini Late 2012.

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