The sensitivity of voltage with respect to positive electrode conductivity is almost white noise

[Azure-Dreamer]

In experiment mode, I set t_interp as [2, 4, 6, ... , 598, 600] to calculate the sensitivity of voltage with respect to positive electrode conductivity. The experiment is

experiment = pybamm.Experiment([(
    "Charge at 6 C for 312.0 seconds",
    "Charge at 3.5 C for 288.0 seconds or until 3.6 V",
)])

But unfortunately, the sensitivity is almost white nose

I'm curious about the reason and wonder if there is any solution to this problem. At least, intuitively, the sensitivity at two adjacent time point should be close in CC charge mode.