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MMWCAS-DSP-EVM: Why does the device drop some frames while capturing frames?

Part Number: MMWCAS-DSP-EVM
Other Parts Discussed in Thread: AWR2243

mode3.zip

I use MMWCAS(AWR2243) kits and here are my lua scripts including configuration.lua and capture.lua. When I used these scripts to capture data, nothing wrong happened. However, I find that there are some frames dropped while capturing.

In detail, I set the device to capture 600 frames and I use advanced frame function(there are 2 subframes in a frame), so there should be 1200 frames in .bin files. However, I check the idx.bin files which shows that there are only 1186 frames recorded. Moreover, the first recorded frame is according to the second subframe's parameters which I set. Subframe1 lasts 15 milliseconds and Subframe2 lasts 85 milliseconds. 

Here is a detailed explanation: