Nvidia Visual Profiler Limitations

Hello! I have a master kernel that iterates several thousand times, calling many child kernels and whatnot, over about 1200 seconds. When I profile this app, the profiler seems to stop collecting kernel invocation information after about 6 seconds, but kicks back in to profile the memory copy from GPU to CPU at the very end. Is there some sort of limitation on the profiler that only records so much information?